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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Tax Note Textuals [Line Items] |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  | $ (22.9)
Tax Benefit, CARES Act | $ 10.7 |  |
Undistributed Earnings of Foreign Subsidiaries | 913.7 |  |
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability, Undistributed Earnings of Foreign Subsidiaries | 240.9 |  |
Net operating loss carryforwards in Luxembourg | 224.9 |  |
Excess Tax benefit from stock activity | 3.0 | $ 4.6 | 2.2
Estimated change in unrecognized tax benefits | 15.0 |  |
Interest (income) expense related to tax matters | (2.0) | (0.3) | (0.9)
Interest accrued from income tax examinations | 0.9 | $ 2.9 | $ 3.2
Continuing Operations [Member] |  |  |
Tax Note Textuals [Line Items] |  |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 16.7 |  |
Discontinued Operations [Member] |  |  |
Tax Note Textuals [Line Items] |  |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 0.5 |  |
Luxembourg Deferred Tax Assets |  |  |
Tax Note Textuals [Line Items] |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | (25.9) |  |
German and UK Deferred Tax Assets |  |  |
Tax Note Textuals [Line Items] |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | $ 21.7 |  |

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