| Pension and Other Postretirement Benefit Expense [Abstract] | Period [Axis] |
|---|
2015-01-01 - 2015-12-31 |
|---|
Pension and Other Postretirement Benefit Expense [Abstract] | |
Schedule Of Allocation of Plan Assets | | | | | | | | | | | Defined Benefit Pension Plan | | Postretirement Benefit Plan | Asset Category | Minimum | | Maximum | | Minimum | | Maximum | Domestic Equities | 25% | | 45% | | 35% | | 55% | International Equities | 15% | | 25% | | 15% | | 25% | Fixed Income | 23% | | 37% | | 20% | | 50% | Real Estate/Private Equity/Hedge Funds | 0% | | 15% | | 0% | | 0% | Short-Term Investments | 0% | | 10% | | 0% | | 10% |
Pension Plan and Postretirement Plan Asset Mix at December 31, 2015 and December 31, 2014: | | | | | | | | | | | | | | | December 31, 2015 | Defined Benefit
Pension Plan Assets | | Postretirement
Benefit Plan Assets | Asset Class | Asset Value | | % of Total Assets | | Asset Value | | % of Total Assets | | (in millions) | | | | (in millions) | | | Domestic Equities | $ | 115.9 |
| | 39.4 | % | | $ | 95.3 |
| | 44.6 | % | International Equities | 51.4 |
| | 17.5 | % | | 40.1 |
| | 18.7 | % | Fixed Income | 101.5 |
| | 34.4 | % | | 71.8 |
| | 33.6 | % | Cash/Other | 25.5 |
| | 8.7 | % | | 6.7 |
| | 3.1 | % | Total | $ | 294.3 |
| | 100.0 | % | | $ | 213.9 |
| | 100.0 | % | | | | | | | | | December 31, 2014 | Defined Benefit
Pension Plan Assets | | Postretirement
Benefit Plan Assets | Asset Class | Asset Value | | % of Total Assets | | Asset Value | | % of Total Assets | | (in millions) | | | | (in millions) | | | Domestic Equities | $ | 125.2 |
| | 41.1 | % | | $ | 99.9 |
| | 47.2 | % | International Equities | 55.0 |
| | 18.1 | % | | 38.9 |
| | 18.4 | % | Fixed Income | 105.0 |
| | 34.4 | % | | 72.2 |
| | 34.1 | % | Real Estate/Private Equity/Hedge Funds | 15.4 |
| | 5.0 | % | | — |
| | — | % | Cash/Other | 4.2 |
| | 1.4 | % | | 0.6 |
| | 0.3 | % | Total | $ | 304.8 |
| | 100.0 | % | | $ | 211.6 |
| | 100.0 | % |
|
Schedule Of Fair Value and Changes In The Fair Value Of The Plan Assets | | | | | | | | | | | | | | | | | | Fair Value Measurements (in millions) | December 31,
2015 | | Quoted Prices in Active
Markets for Identical Assets (Level 1) | | Significant Other
Observable Inputs (Level 2) | | Significant
Unobservable Inputs (Level 3) | Pension plan assets | | | | | | | | Cash | $ | 0.8 |
| | $ | 0.8 |
| | $ | — |
| | $ | — |
| Equity securities | | | | | | | | International equities | 5.4 |
| | 5.4 |
| | — |
| | — |
| Fixed income securities | | | | | | | | Government | 7.1 |
| | — |
| | 7.1 |
| | — |
| Corporate | 10.8 |
| | — |
| | 10.8 |
| | — |
| Commingled funds | | | | | | | | Short-term money markets | 25.5 |
| | — |
| | 25.5 |
| | — |
| U.S. equities | 115.9 |
| | — |
| | 115.9 |
| | — |
| International equities | 45.7 |
| | — |
| | 45.7 |
| | — |
| Fixed income | 83.1 |
| | — |
| | 83.1 |
| | — |
| Pension plan assets subtotal | 294.3 |
| | 6.2 |
| | 288.1 |
| | — |
| Other postretirement benefit plan assets | | | | | | | | Commingled funds | | | | | | | | Short-term money markets | 6.8 |
| | — |
| | 6.8 |
| | — |
| U.S. equities | 13.0 |
| | — |
| | 13.0 |
| | — |
| Mutual funds | | | | | | | | U.S. equities | 82.3 |
| | 82.3 |
| | — |
| | — |
| International equities | 40.1 |
| | 40.1 |
| | — |
| | — |
| Fixed income | 71.7 |
| | 71.7 |
| | — |
| | — |
| Other postretirement benefit plan assets subtotal | 213.9 |
| | 194.1 |
| | 19.8 |
| | — |
| Due to brokers, net(1) | (0.3 | ) | | | | | | | Accrued investment income/dividends | 0.5 |
| | | | | | | Total pension and other postretirement benefit plan assets | $ | 508.4 |
| | $ | 200.3 |
| | $ | 307.9 |
| | $ | — |
|
(1) This class represents pending trades with brokers.
The table below sets forth a summary of changes in the fair value of the Plan’s Level 3 assets for the year ended December 31, 2015: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | (in millions) | Balance at January 1, 2015 | | Total gains or losses (unrealized / realized) | | Purchases | | (Sales) | | Transfers into/(out of) level 3 | | Separation Allocation(1) | | Balance at December 31, 2015 | Fixed income securities | | | | | | | | | | | | | | Other fixed income | $ | 0.1 |
| | $ | — |
| | $ | — |
| | $ | — |
| | $ | — |
| | $ | (0.1 | ) | | $ | — |
| Private equity limited partnerships | | | | | | | | | | | | | | U.S. multi-strategy | 7.3 |
| | — |
| | — |
| | — |
| | — |
| | (7.3 | ) | | — |
| International multi-strategy | 4.6 |
| | — |
| | — |
| | — |
| | — |
| | (4.6 | ) | | — |
| Distressed opportunities | 1.0 |
| | — |
| | — |
| | — |
| | — |
| | (1.0 | ) | | — |
| Real estate | 2.3 |
| | — |
| | — |
| | — |
| | — |
| | (2.3 | ) | | — |
| Total | $ | 15.3 |
| | $ | — |
| | $ | — |
| | $ | — |
| | $ | — |
| | $ | (15.3 | ) | | $ | — |
|
(1) Level 3 assets were not contributed to the Plans upon Separation from NiSource and no subsequent investments were made in Level 3 assets post Separation. The following table reflects the Partnership's allocation of pension and other postretirement benefit amounts: | | | | | | | | | | | | | | | | | Fair Value Measurements (in millions) | December 31,
2014 | | Quoted Prices in Active
Markets for Identical Assets (Level 1) | | Significant Other
Observable Inputs (Level 2) | | Significant
Unobservable Inputs (Level 3) | Pension plan assets | | | | | | | | Cash | $ | 2.2 |
| | $ | 2.2 |
| | $ | — |
| | $ | — |
| Equity securities | | | | | | | | International equities | 17.6 |
| | 17.5 |
| | 0.1 |
| | — |
| Fixed income securities | | | | | | | | Government | 15.5 |
| | 13.7 |
| | 1.8 |
| | — |
| Corporate | 33.6 |
| | — |
| | 33.6 |
| | — |
| Mortgages/Asset backed securities | 0.4 |
| | — |
| | 0.4 |
| | — |
| Other fixed income | 0.1 |
| | — |
| | — |
| | 0.1 |
| Commingled funds | | | | | | | | Short-term money markets | 4.3 |
| | — |
| | 4.3 |
| | — |
| U.S. equities | 125.2 |
| | — |
| | 125.2 |
| | — |
| International equities | 36.6 |
| | — |
| | 36.6 |
| | — |
| Fixed income | 53.5 |
| | — |
| | 53.5 |
| | — |
| Private equity limited partnerships | | | | | | | | U.S. multi-strategy(1) | 7.3 |
| | — |
| | — |
| | 7.3 |
| International multi-strategy(2) | 4.6 |
| | — |
| | — |
| | 4.6 |
| Distressed opportunities | 1.0 |
| | — |
| | — |
| | 1.0 |
| Real Estate | 2.3 |
| | — |
| | — |
| | 2.3 |
| Pension plan assets subtotal | 304.2 |
| | 33.4 |
| | 255.5 |
| | 15.3 |
| Other postretirement benefit plan assets | | | | | | | | Commingled funds | | | | | | | | Short-term money markets | 0.7 |
| | — |
| | 0.7 |
| | — |
| U.S. equities | 13.6 |
| | — |
| | 13.6 |
| | — |
| Mutual funds | | | | | | | | U.S. equities | 86.4 |
| | 86.4 |
| | — |
| | — |
| International equities | 38.9 |
| | 38.9 |
| | — |
| | — |
| Fixed income | 72.0 |
| | 72.0 |
| | — |
| | — |
| Other postretirement benefit plan assets subtotal | 211.6 |
| | 197.3 |
| | 14.3 |
| | — |
| Due to brokers, net(3) | (0.1 | ) | | | | | | | Accrued investment income/dividends | 0.1 |
| | | | | | | Net receivables | 0.6 |
| | | | | | | Total pension and other postretirement benefit plan assets | $ | 516.4 |
| | $ | 230.7 |
| | $ | 269.8 |
| | $ | 15.3 |
|
(1) This class includes limited partnerships/fund of funds that invest in a diverse portfolio of private equity strategies, including buy-outs, venture capital, growth capital, special situations and secondary markets, primarily in the United States. (2) This class includes limited partnerships/fund of funds that invest in a diverse portfolio of private equity strategies, including buy-outs, venture capital, growth capital, special situations and secondary markets, primarily outside the United States. (3) This class represents pending trades with brokers. The table below sets forth a summary of changes in the fair value of the Plan’s Level 3 assets for the year ended December 31, 2014: | | | | | | | | | | | | | | | | | | | | | | | | | (in millions) | Balance at January 1, 2014 | | Total gains or losses (unrealized / realized) | | Purchases | | (Sales) | | Transfers into/(out of) level 3 | | Balance at December 31, 2014 | Fixed income securities | | | | | | | | | | | | Other fixed income | $ | — |
| | $ | — |
| | $ | 0.1 |
| | $ | — |
| | $ | — |
| | $ | 0.1 |
| Private equity limited partnerships | | | | | | | | | | | | U.S. multi-strategy | 7.6 |
| | 0.3 |
| | 0.3 |
| | (0.9 | ) | | — |
| | 7.3 |
| International multi-strategy | 5.0 |
| | (0.1 | ) | | 0.1 |
| | (0.4 | ) | | — |
| | 4.6 |
| Distress opportunities | 1.2 |
| | — |
| | — |
| | (0.2 | ) | | — |
| | 1.0 |
| Real estate | 2.6 |
| | 0.3 |
| | — |
| | (0.6 | ) | | — |
| | 2.3 |
| Total | $ | 16.4 |
| | $ | 0.5 |
| | $ | 0.5 |
| | $ | (2.1 | ) | | $ | — |
| | $ | 15.3 |
|
|
Schedule Of Reconciliation Of The Plan Funded Status | | | | | | | | | | | | | | | | | | | Pension Benefits | | Other Postretirement Benefits | (in millions) | 2015 | | 2014 | | 2015 | | 2014 | | | | Predecessor | | | | Predecessor | Change in projected benefit obligation(1) | | | | | | | | Benefit obligation at beginning of year | $ | 345.2 |
| | $ | 327.1 |
| | $ | 108.9 |
| | $ | 105.5 |
| Service cost | 5.3 |
| | 4.8 |
| | 1.0 |
| | 1.1 |
| Interest cost | 12.5 |
| | 13.7 |
| | 4.0 |
| | 4.6 |
| Plan participants’ contributions | — |
| | — |
| | 1.6 |
| | 1.9 |
| Actuarial loss (gain) | (7.3 | ) | | 20.0 |
| | (11.6 | ) | | 4.6 |
| Benefits paid | (23.5 | ) | | (20.4 | ) | | (7.5 | ) | | (9.1 | ) | Estimated benefits paid by incurred subsidy | — |
| | — |
| | 0.2 |
| | 0.3 |
| Contributed/noncontributed projected benefit obligation(2) | (4.6 | ) |
| — |
| | (3.2 | ) | | — |
| Projected benefit obligation at end of year | $ | 327.6 |
| | $ | 345.2 |
| | $ | 93.4 |
| | $ | 108.9 |
| Change in plan assets | | | | | | | | Fair value of plan assets at beginning of year | $ | 304.7 |
| | $ | 299.1 |
| | $ | 211.6 |
| | $ | 198.8 |
| Actual return on plan assets | 0.6 |
| | 19.3 |
| | (2.0 | ) | | 9.2 |
| Employer contributions | 16.5 |
| | 6.7 |
| | 11.3 |
| | 10.8 |
| Plan participants’ contributions | — |
| | — |
| | 1.6 |
| | 1.9 |
| Benefits paid | (23.5 | ) | | (20.4 | ) | | (7.5 | ) | | (9.1 | ) | Contributed/noncontributed plan assets(2) | (4.0 | ) | | — |
| | (1.1 | ) | | — |
| Fair value of plan assets at end of year | $ | 294.3 |
| | $ | 304.7 |
| | $ | 213.9 |
| | $ | 211.6 |
| Funded status at end of year | $ | (33.3 | ) | | $ | (40.5 | ) | | $ | 120.5 |
|
| $ | 102.7 |
| Amounts recognized in the statement of financial position consist of: | | | | | | | | Noncurrent assets | $ | — |
| | $ | — |
| | $ | 120.5 |
| | $ | 109.8 |
| Current liabilities | (0.1 | ) | | — |
| | — |
| | — |
| Noncurrent liabilities | (33.2 | ) | | (40.5 | ) | | — |
| | (7.1 | ) | Net amount recognized at end of year(3) | $ | (33.3 | ) | | $ | (40.5 | ) | | $ | 120.5 |
| | $ | 102.7 |
| Amounts recognized as regulatory assets/liabilities(4) | | | | | | | | Unrecognized prior service (credit) cost | $ | (3.0 | ) | | $ | (4.0 | ) | | $ | 0.1 |
| | $ | 0.1 |
| Unrecognized actuarial loss (gain) | 130.3 |
| | 124.5 |
| | (0.4 | ) | | (8.3 | ) | Total recognized regulatory assets (liabilities) | $ | 127.3 |
| | $ | 120.5 |
| | $ | (0.3 | ) | | $ | (8.2 | ) |
(1) The change in benefit obligation for Pension Benefits represents the change in Projected Benefit Obligation while the change in benefit obligation for Other Postretirement Benefits represents the change in Accumulated Postretirement Benefit Obligation. (2) Reflects the removal of amounts related to Crossroads Pipeline Company and CPGSC, which were included in the Predecessor, but were not contributed to the Partnership, as well as the inclusion of CNS Microwave, which was not part of the Predecessor. (3) The Partnership recognizes in its Consolidated and Combined Balance Sheets the underfunded and overfunded status of its defined benefit postretirement plans, measured as the difference between the fair value of the plan assets and the benefit obligation. (4) The Partnership determined that the future recovery of pension and other postretirement benefits costs is probable. The Partnership recorded regulatory assets and liabilities of $127.1 million and $0.6 million, respectively, as of December 31, 2015, and $120.9 million and $8.3 million, respectively, as of December 31, 2014 that would otherwise have been recorded to accumulated other comprehensive loss. |
Schedule Of Significant Actuarial Assumptions In Determining Funded Status Plan | | | | | | | | | | | | | | | Pension Benefits | | Other Postretirement Benefits | | 2015 | | 2014 | | 2015 | | 2014 | | | | Predecessor | | | | Predecessor | Weighted-average assumptions to determine benefit obligation | | | | | | | | Discount Rate | 4.05 | % | | 3.64 | % | | 4.28 | % | | 3.95 | % | Rate of Compensation Increases | 4.00 | % | | 4.00 | % | | | | | Health Care Trend Rates | | | | | | | | Trend for Next Year | | | | | 8.38 | % | | 6.90 | % | Ultimate Trend | | | | | 4.50 | % | | 4.50 | % | Year Ultimate Trend Reached | | | | | 2022 |
| | 2021 |
|
|
Schedule Of One-Percentage-Point Change In Assumed Health Care Cost Trend Rates | | | | | | | | | | (in millions) | 1% point increase | | 1% point decrease | Effect on service and interest components of net periodic cost | $ | 0.1 |
| | $ | (0.1 | ) | Effect on accumulated postretirement benefit obligation | 2.5 |
| | (2.3 | ) |
|
Schedule Of Expected Payments To Participants In Pension Plan | | | | | | | | | | | | | | (in millions) | Pension Benefits | | Other
Postretirement Benefits | | Federal
Subsidy Receipts | Year(s) | | | | | | 2016 | $ | 27.2 |
| | $ | 6.2 |
| | $ | 0.3 |
| 2017 | 27.1 |
| | 6.2 |
| | 0.3 |
| 2018 | 27.9 |
| | 6.3 |
| | 0.3 |
| 2019 | 28.0 |
| | 6.4 |
| | 0.3 |
| 2020 | 30.0 |
| | 6.4 |
| | 0.3 |
| 2021-2025 | 145.8 |
| | 31.4 |
| | 1.2 |
|
|
Components Of The Plans' Net Periodic Benefits Cost | | | | | | | | | | | | | | | | | | | | | | | | | | | Pension Benefits | | Other Postretirement Benefits | (in millions) | 2015 | | 2014 | | 2013 | | 2015 | | 2014 | | 2013 | | | | Predecessor | | Predecessor | | | | Predecessor | | Predecessor | Components of Net Periodic Benefit Cost (Income) | | | | | | | | | | | | Service cost | $ | 5.3 |
| | $ | 4.8 |
| | $ | 4.8 |
| | $ | 1.0 |
| | $ | 1.1 |
| | $ | 1.5 |
| Interest cost | 12.5 |
| | 13.7 |
| | 12.6 |
| | 4.0 |
| | 4.6 |
| | 4.9 |
| Expected return on assets | (23.6 | ) | | (23.8 | ) | | (22.0 | ) | | (17.4 | ) | | (16.5 | ) | | (13.5 | ) | Amortization of prior service (credit) cost | (0.9 | ) | | (1.0 | ) | | (0.9 | ) | | 0.1 |
| | 0.1 |
| | 0.1 |
| Recognized actuarial loss (gain) | 8.2 |
| | 6.6 |
| | 10.6 |
| | (0.2 | ) | | (0.1 | ) | | 1.0 |
| Net Periodic Benefit Cost (Income) | 1.5 |
| | 0.3 |
| | 5.1 |
| | (12.5 | ) | | (10.8 | ) | | (6.0 | ) | Settlement loss | — |
| | — |
| | 12.4 |
| | — |
| | — |
| | — |
| Total Net Periodic Benefit Cost (Income) | $ | 1.5 |
| | $ | 0.3 |
| | $ | 17.5 |
| | $ | (12.5 | ) | | $ | (10.8 | ) | | $ | (6.0 | ) |
|
Schedule Of Key Assumptions That Were Used To Calculate The Net Periodic Benefits Cost | | | | | | | | | | | | | | | | | | | | | Pension Benefits | | Other Postretirement Benefits | | 2015 | | 2014 | | 2013 | | 2015 | | 2014 | | 2013 | | | | Predecessor | | Predecessor | | | | Predecessor | | Predecessor | Weighted-average assumptions to determine net periodic benefit cost | | | | | | | | | | | | Discount Rate | 3.84 | % | | 4.34 | % | | 3.36 | % | | 4.09 | % | | 4.74 | % | | 3.92 | % | Expected Long-Term Rate of Return on Plan Assets | 8.20 | % | | 8.30 | % | | 8.30 | % | | 8.06 | % | | 8.14 | % | | 8.15 | % | Rate of Compensation Increases | 4.00 | % | | 4.00 | % | | 4.00 | % | | | | | | |
|
Schedule Of Changes In Plan Assets And Projected Benefit Obligations Recognized In Other Comprehensive Income | | | | | | | | | | | | | | | | | | | Pension Benefits | | Other Postretirement Benefits | (in millions) | 2015 | | 2014 | | 2015 | | 2014 | | | | Predecessor | | | | Predecessor | Other changes in plan assets and projected benefit obligations recognized in regulatory assets/liabilities | | | | | | | | Net actuarial loss | $ | 14.1 |
| | $ | 24.4 |
| | $ | 7.8 |
| | $ | 11.7 |
| Less: amortization of prior service (credit) cost | 0.9 |
| | 1.0 |
| | (0.1 | ) | | — |
| Less: amortization of net actuarial (gain) loss | (8.2 | ) | | (6.6 | ) | | 0.2 |
| | — |
| Total recognized in regulatory assets/liabilities | $ | 6.8 |
| | $ | 18.8 |
| | $ | 7.9 |
| | $ | 11.7 |
| Amount recognized in net periodic benefit cost and regulatory assets/liabilities | $ | 8.3 |
| | $ | 19.1 |
| | $ | (4.6 | ) | | $ | 0.9 |
|
|