| Compensation and Retirement Disclosure [Abstract] | Period [Axis] |
|---|
2016-01-01 - 2016-12-31 |
|---|
Compensation and Retirement Disclosure [Abstract] | |
Defined Benefit Pension and Other Postretirement Benefits Plans | The following table reflects changes in the projected obligations and fair market values of assets in all defined benefit pension and other postretirement benefit plans of the Company: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 2016 Pension Benefits | | 2015 Pension Benefits | | Other Postretirement Benefits | | Domestic | | International | | Total | | Domestic | | International | | Total | | 2016 | | 2015 | Change in benefit obligation: | | | | | | | | | | | | | | | | Projected Benefit Obligation at beginning of year | $ | 1,045,467 |
| | $ | 405,884 |
| | $ | 1,451,351 |
| | $ | 1,105,100 |
| | $ | 457,233 |
| | $ | 1,562,333 |
| | $ | 265,579 |
| | $ | 278,867 |
| Service cost - employer | 9,613 |
| | 9 |
| | 9,622 |
| | 11,037 |
| | 9 |
| | 11,046 |
| | 2,149 |
| | 2,513 |
| Interest cost | 41,595 |
| | 14,097 |
| | 55,692 |
| | 40,202 |
| | 15,853 |
| | 56,055 |
| | 10,819 |
| | 10,320 |
| Actuarial (gain)/loss | 26,618 |
| | 81,180 |
| | 107,798 |
| | (52,663 | ) | | (27,763 | ) | | (80,426 | ) | | (5,760 | ) | | (13,726 | ) | Benefits paid | (53,405 | ) | | (12,846 | ) | | (66,251 | ) | | (58,209 | ) | | (14,321 | ) | | (72,530 | ) | | (10,512 | ) | | (12,395 | ) | Settlements | (29,390 | ) | | — |
| | (29,390 | ) | | — |
| | — |
| | — |
| | — |
| | — |
| Foreign currency translation effect | — |
| | (65,796 | ) | | (65,796 | ) | | — |
| | (25,127 | ) | | (25,127 | ) | | — |
| | — |
| Projected Benefit Obligation at December 31 | $ | 1,040,498 |
| | $ | 422,528 |
| | $ | 1,463,026 |
| | $ | 1,045,467 |
| | $ | 405,884 |
| | $ | 1,451,351 |
| | $ | 262,275 |
| | $ | 265,579 |
| Change in plans’ assets: | | | | | | | | | | | | | | | | Fair value of plans’ assets at beginning of year | $ | 836,514 |
| | $ | 309,916 |
| | $ | 1,146,430 |
| | $ | 857,825 |
| | $ | 330,848 |
| | $ | 1,188,673 |
| | $ | — |
| | $ | — |
| Actual return on plans’ assets | 59,310 |
| | 77,711 |
| | 137,021 |
| | 1,095 |
| | (746 | ) | | 349 |
| | — |
| | — |
| Employer contribution | 35,312 |
| | 10,763 |
| | 46,075 |
| | 35,803 |
| | 12,027 |
| | 47,830 |
| | — |
| | — |
| Benefits paid | (53,405 | ) | | (12,846 | ) | | (66,251 | ) | | (58,209 | ) | | (14,321 | ) | | (72,530 | ) | | — |
| | — |
| Settlements | (29,390 | ) | | — |
| | (29,390 | ) | | — |
| | — |
| | — |
| | — |
| | — |
| Foreign currency translation effect | — |
| | (57,011 | ) | | (57,011 | ) | | — |
| | (17,892 | ) | | (17,892 | ) | | — |
| | — |
| Fair value of plans’ assets at December 31 | $ | 848,341 |
| | $ | 328,533 |
| | $ | 1,176,874 |
| | $ | 836,514 |
| | $ | 309,916 |
| | $ | 1,146,430 |
| | $ | — |
| | $ | — |
| Funded status | $ | (192,157 | ) | | $ | (93,995 | ) | | $ | (286,152 | ) | | $ | (208,953 | ) | | $ | (95,968 | ) | | $ | (304,921 | ) | | $ | (262,275 | ) | | $ | (265,579 | ) | Amounts recognized in the balance sheets: | | | | | | | | | | | | | | | | Accrued liabilities | $ | (300 | ) | | $ | — |
| | $ | (300 | ) | | $ | (300 | ) | | $ | — |
| | $ | (300 | ) | | $ | (15,048 | ) | | $ | (15,929 | ) | Postretirement benefits other than pensions | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | $ | (247,227 | ) | | $ | (249,650 | ) | Pension benefits | $ | (191,857 | ) | | $ | (93,995 | ) | | $ | (285,852 | ) | | $ | (208,653 | ) | | $ | (95,968 | ) | | $ | (304,621 | ) | | — |
| | — |
|
|
Weighted Average Assumptions Used to Determine Benefit Obligations | Weighted average assumptions used to determine benefit obligations at December 31: | | | | | | | | | | | | | | | | Pension Benefits | | Other Postretirement Benefits | | | 2016 | | 2015 | | 2016 | | 2015 | All plans | | | | | | | | | Discount rate | | 3.54 | % | | 4.10 | % | | 3.95 | % | | 4.20 | % | Domestic plans | | | | | | | | | Discount rate | | 3.90 | % | | 4.20 | % | | 3.95 | % | | 4.20 | % | Foreign plans | | | | | | | | | Discount rate | | 2.65 | % | | 3.84 | % | | — |
| | — |
|
|
Components of Net Periodic Benefit Costs | At December 31, 2016, the weighted average assumed annual rate of increase in the cost of medical benefits was 7.00 percent for 2017 trending linearly to 4.50 percent per annum in 2024. | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pension Benefits - Domestic | | Pension Benefits - International | | | 2016 | | 2015 | | 2014 | | 2016 | | 2015 | | 2014 | Components of net periodic benefit cost: | | | | | | | | | | | | | Service cost | | $ | 9,613 |
| | $ | 11,037 |
| | $ | 9,760 |
| | $ | 9 |
| | $ | 9 |
| | $ | 8 |
| Interest cost | | 41,595 |
| | 40,202 |
| | 42,842 |
| | 14,097 |
| | 15,853 |
| | 19,620 |
| Expected return on plan assets | | (57,438 | ) | | (55,299 | ) | | (52,543 | ) | | (11,322 | ) | | (12,421 | ) | | (19,977 | ) | Amortization of actuarial loss | | 38,490 |
| | 39,514 |
| | 28,021 |
| | 5,134 |
| | 7,222 |
| | 8,452 |
| Effect of settlements | | 12,262 |
| | — |
| | — |
| | — |
| | — |
| | — |
| Net periodic benefit cost | | $ | 44,522 |
| | $ | 35,454 |
| | $ | 28,080 |
| | $ | 7,918 |
| | $ | 10,663 |
| | $ | 8,103 |
|
|
Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost | | | | | | | | | | | | | | | | | Other Post Retirement Benefits | | | 2016 | | 2015 | | 2014 | Components of net periodic benefit cost: | | | | | | | Service cost | | $ | 2,149 |
| | $ | 2,513 |
| | $ | 2,404 |
| Interest cost | | 10,819 |
| | 10,320 |
| | 11,305 |
| Amortization of prior service cost | | (566 | ) | | (566 | ) | | (566 | ) | Amortization of actuarial loss | | — |
| | — |
| | — |
| Net periodic benefit cost | | $ | 12,402 |
| | $ | 12,267 |
| | $ | 13,143 |
|
|
Projected Benefit Obligation, Accumulated Benefit Obligation and Fair Value of Plan Assets for Pension Plans | The following table lists the projected benefit obligation, accumulated benefit obligation and fair value of plan assets for the pension plans with projected benefit obligations and accumulated benefit obligations in excess of plan assets at December 31, 2016 and 2015: | | | | | | | | | | | | | | | | | | | | 2016 | | 2015 | | | Projected benefit obligation exceeds plan assets | | Accumulated benefit obligation exceeds plan assets | | Projected benefit obligation exceeds plan assets | | Accumulated benefit obligation exceeds plan assets | Projected benefit obligation | | $ | 1,463,026 |
| | $ | 1,463,026 |
| | $ | 1,451,351 |
| | $ | 1,451,351 |
| Accumulated benefit obligation | | 1,459,809 |
| | 1,459,809 |
| | 1,448,277 |
| | 1,448,277 |
| Fair value of plan assets | | 1,176,874 |
| | 1,176,874 |
| | 1,146,430 |
| | 1,146,430 |
|
Weighted-average assumptions used to determine net periodic benefit cost for the years ended December 31: | | | | | | | | | | | | | | | | | | | | | | Pension Benefits | | Other Postretirement Benefits | | | 2016 | | 2015 | | 2014 | | 2016 | | 2015 | | 2014 | All plans | | | | | | | | | | | | | Discount rate | | 4.10 | % | | 3.70 | % | | 4.53 | % | | 4.20 | % | | 3.80 | % | | 4.60 | % | Expected return on plan assets | | 6.16 | % | | 6.12 | % | | 6.91 | % | | — | % | | — | % | | — | % | Rate of compensation increase | | — | % | | — | % | | — | % | | — | % | | — | % | | — | % | Domestic plans | | | | | | | | | | | | | Discount rate | | 4.20 | % | | 3.75 | % | | 4.55 | % | | 4.20 | % | | 3.80 | % | | 4.60 | % | Expected return on plan assets | | 7.00 | % | | 7.00 | % | | 7.00 | % | | — | % | | — | % | | — | % | Foreign plans | | | | | | | | | | | | | Discount rate | | 3.84 | % | | 3.59 | % | | 4.49 | % | | — | % | | — | % | | — | % | Expected return on plan assets | | 3.99 | % | | 3.84 | % | | 6.66 | % | | — | % | | — | % | | — | % | Rate of compensation increase | | — | % | | — | % | | — | % | | — | % | | — | % | | — | % |
|
One-Percentage-Point Change in Assumed Health Care Cost Trend Rates | A one-percentage-point change in assumed health care cost trend rates would have the following effects: | | | | | | | | | | | | Percentage Point | | | Increase | | Decrease | Increase (decrease) in total service and interest cost components | | $ | 47 |
| | $ | (43 | ) | Increase (decrease) in the postretirement benefit obligation | | 1,201 |
| | (1,087 | ) |
|
Weighted Average Asset Allocations for Domestic and U.K. Pension Plans' Assets | The table below presents the Company’s weighted average asset allocations for its domestic and U.K. pension plans’ assets at December 31, 2016 and December 31, 2015 by asset category. | | | | | | | | | | | | | | | | U.S. Plans | | U.K. Plan | Asset Category | | 2016 | | 2015 | | 2016 | | 2015 | Equity securities | | 63 | % | | 62 | % | | 18 | % | | 21 | % | Debt securities | | 36 |
| | 38 |
| | 68 |
| | 70 |
| Other investments | | 0 |
| | 0 |
| | 14 |
| | 9 |
| Cash | | 1 |
| | 0 |
| | 0 |
| | 0 |
| Total | | 100 | % | | 100 | % | | 100 | % | | 100 | % |
|
Assets of U.S and U.K Plans Using Fair Value Hierarchy | | | | | | | | | | | | | | | | | | | | | | | Fair Value Hierarchy | | | Total | | Level 1 | | Level 2 | | Level 3 | December 31, 2016 | | | | | | | | | United States plans | | | | | | | | | Cash and cash equivalents | | $ | 8,491 |
| | $ | 8,491 |
| | $ | — |
| | $ | — |
| Equity securities | | 531,939 |
| | 184,690 |
| | 347,249 |
| | — |
| Fixed income securities | | 307,911 |
| | 138,988 |
| | 168,923 |
| | — |
| | | $ | 848,341 |
| | $ | 332,169 |
| | $ | 516,172 |
| | $ | — |
| United Kingdom plan | | | | | | | | | Cash and cash equivalents | | $ | 1,078 |
| | $ | 1,078 |
| | $ | — |
| | $ | — |
| Equity securities | | 60,185 |
| | 60,185 |
| | — |
| | — |
| Fixed income securities | | 220,974 |
| | 220,974 |
| | — |
| | — |
| Other investments | | 44,596 |
| | — |
| | 10,800 |
| | 33,796 |
| | | $ | 326,833 |
| | $ | 282,237 |
| | $ | 10,800 |
| | $ | 33,796 |
| December 31, 2015 | | | | | | | | | United States plans | | | | | | | | | Cash and cash equivalents | | $ | 724 |
| | $ | 724 |
| | $ | — |
| | $ | — |
| Equity securities | | 520,202 |
| | 174,163 |
| | 346,039 |
| | — |
| Fixed income securities | | 315,588 |
| | 133,420 |
| | 182,168 |
| | — |
| | | $ | 836,514 |
| | $ | 308,307 |
| | $ | 528,207 |
| | $ | — |
| United Kingdom plan | | | | | | | | | Cash and cash equivalents | | $ | 917 |
| | $ | 917 |
| | $ | — |
| | $ | — |
| Equity securities | | 65,391 |
| | 65,391 |
| | — |
| | — |
| Fixed income securities | | 214,762 |
| | 214,762 |
| | — |
| | — |
| Other investments | | 27,062 |
| | — |
| | — |
| | 27,062 |
| | | $ | 308,132 |
| | $ | 281,070 |
| | $ | — |
| | $ | 27,062 |
|
|
Details of Activity in Investment in European Infrastructure and Property Funds | The following table details the activity in these investments for the years ended December 31, 2015 and 2016: | | | | | | U.K. Plan Level 3 Assets | Balance at December 31, 2014 | $ | 25,812 |
| Transfer into level 3 | — |
| Disbursements | — |
| Change in fair value | 2,798 |
| Foreign currency translation effect | (1,548 | ) | Balance at December 31, 2015 | 27,062 |
| Transfer into level 3 | 9,489 |
| Disbursements | — |
| Change in fair value | 3,545 |
| Foreign currency translation effect | (6,300 | ) | Balance at December 31, 2016 | $ | 33,796 |
|
|
Estimated Benefit Payments for Domestic and Foreign Pension Plans and Other Postretirement Benefit Plans | The Company estimates its benefit payments for its domestic and foreign pension plans and other postretirement benefit plans during the next ten years to be as follows: | | | | | | | | | | | | Pension Benefits | | Other Postretirement Benefits | 2017 | | $ | 80,165 |
| | $ | 15,048 |
| 2018 | | 77,831 |
| | 15,419 |
| 2019 | | 78,408 |
| | 15,778 |
| 2020 | | 79,396 |
| | 16,321 |
| 2021 | | 80,097 |
| | 16,518 |
| 2022 through 2026 | | 410,651 |
| | 83,011 |
|
|