Slicers (applies to each fact value in each table cell)

Reporting Entity [Axis]

0000832988 (http://www.sec.gov/CIK)

Compensation and Retirement Disclosure [Abstract]	Period [Axis]
	2016-01-31 - 2017-01-28
Compensation and Retirement Disclosure [Abstract]
Schedule of Changes in Fair Value of Plan Assets	The following tables provide information concerning the UK Plan as of and for the fiscal years ended January 28, 2017 and January 30, 2016: (in millions) Fiscal 2017   Fiscal 2016 Change in UK Plan assets:       Fair value at beginning of year $ 266.2   $ 295.8 Actual return on UK Plan assets 18.2   (4.8 ) Employer contributions 3.3   2.5 Members’ contributions 0.6   0.7 Benefits paid (9.9 )   (11.2 ) Foreign currency translation (30.8 )   (16.8 ) Fair value at end of year $ 247.6   $ 266.2
Schedule of Changes in Projected Benefit Obligations	(in millions) Fiscal 2017   Fiscal 2016 Change in benefit obligation:       Benefit obligation at beginning of year $ 214.9   $ 258.8 Service cost 2.0   2.6 Past service cost 0.5   0.6 Interest cost 7.2   7.7 Members’ contributions 0.6   0.7 Actuarial (gain) loss 24.1   (29.4 ) Benefits paid (9.9 )   (11.2 ) Foreign currency translation (23.7 )   (14.9 ) Benefit obligation at end of year $ 215.7   $ 214.9 Funded status at end of year $ 31.9   $ 51.3
Schedule of Amounts Recognized in Balance Sheet	(in millions) January 28, 2017   January 30, 2016 Amounts recognized in the balance sheet consist of:       Non-current assets $ 31.9   $ 51.3 Non-current liabilities —   — Net asset recognized $ 31.9   $ 51.3
Schedule of Net Periodic Benefit Cost Not yet Recognized	Items in AOCI not yet recognized as income (expense) in the income statement: (in millions) January 28, 2017   January 30, 2016   January 31, 2015 Net actuarial losses $ (55.5 )   $ (43.1 )   $ (56.7 ) Net prior service credits 9.2   11.1   13.3
Components of Net Benefit Costs	The components of net periodic pension benefit (cost) and other amounts recognized in OCI for the UK Plan are as follows: (in millions) Fiscal 2017   Fiscal 2016   Fiscal 2015 Components of net periodic pension benefit (cost):           Service cost $ (2.0 )   $ (2.6 )   $ (2.3 ) Interest cost (7.2 )   (7.7 )   (9.7 ) Expected return on UK Plan assets 10.4   11.5   14.7 Amortization of unrecognized actuarial losses (1.5 )   (3.4 )   (2.0 ) Amortization of unrecognized net prior service credits 1.9   2.2   1.7 Net periodic pension benefit $ 1.6   $ —   $ 2.4 Other changes in assets and benefit obligations recognized in OCI (17.8 )   14.4   (21.0 ) Total recognized in net periodic pension benefit (cost) and OCI $ (16.2 )   $ 14.4   $ (18.6 )
Schedule of Assumptions Used	January 28, 2017   January 30, 2016 Assumptions used to determine benefit obligations (at the end of the year):       Discount rate 2.90 %   3.60 % Salary increases 2.00 %   2.50 % Assumptions used to determine net periodic pension costs (at the start of the year):       Discount rate 3.60 %   3.00 % Expected return on UK Plan assets 4.20 %   3.90 % Salary increases 2.50 %   2.50 %
Schedule of Allocation of Plan Assets	The value and classification of these assets are as follows:   Fair value measurements as of January 28, 2017   Fair value measurements as of January 30, 2016 (in millions) Total   Quoted prices in active markets for identical assets (Level 1)   Significant other observable inputs (Level 2)   Total   Quoted prices in active markets for identical assets (Level 1)   Significant other observable inputs (Level 2) Assets:                       Corporate-owned life insurance plans $ 7.5   $ —   $ 7.5   $ 8.3   $ —   $ 8.3 Money market funds 29.6   29.6   —   25.1   25.1   — Total assets $ 37.1   $ 29.6   $ 7.5   $ 33.4   $ 25.1   $ 8.3 The methods Signet uses to determine fair value on an instrument-specific basis are detailed below:   Fair value measurements as of January 28, 2017   Fair value measurements as of January 30, 2016 (in millions) Total   Quoted prices in active markets for identical assets (Level 1)   Significant other observable inputs (Level 2)   Significant Unobservable inputs (Level 3)   Total   Quoted prices in active markets for identical assets (Level 1)   Significant other observable inputs (Level 2)   Significant unobservable inputs (Level 3) Asset category:                       Diversified equity securities $ 22.3   $ —   $ 22.3   $ —   $ 21.2   $ 11.3   $ 9.9   $ — Diversified growth funds 80.9   40.7   40.2   —   90.5   44.8   45.7   — Fixed income – government bonds 81.0   —   81.0   —   87.1   —   87.1   — Fixed income – corporate bonds 48.1   —   48.1   —   53.6   —   53.6   — Property 11.8   —   —   11.8   13.0   —   —   13.0 Cash 3.5   3.5   —   —   0.8   0.8   —   — Total $ 247.6   $ 44.2   $ 191.6   $ 11.8   $ 266.2   $ 56.9   $ 196.3   $ 13.0
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets	The table below sets forth changes in the fair value of the Level 3 investment assets in Fiscal 2017 and Fiscal 2016: (in millions) Significant unobservable inputs (Level 3) Balance as of January 31, 2015 $ 12.3 Actual return on assets 0.7 Balance as of January 30, 2016 $ 13.0 Actual return on assets (1.2 ) Balance as of January 28, 2017 $ 11.8
Schedule of Expected Benefit Payments	The following benefit payments, which reflect expected future service, as appropriate, are estimated to be paid by the UK Plan: (in millions) Expected benefit payments Fiscal 2018 $ 9.7 Fiscal 2019 7.3 Fiscal 2020 7.6 Fiscal 2021 8.0 Fiscal 2022 8.2 Thereafter $ 42.6