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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 18, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Income Tax Contingency [Line Items] |  |  |  |  |
Effective Income Tax Rate |  | 16.80% | (226.50%) | 0.00% | 20.30%
Discrete tax benefit for a withholding tax refund received from Switzerland |  | $ (13.2) |  |  |
Discrete tax benefit related to change in tax status of various non-U.S. jurisdictions |  | (10.7) |  | $ (10.7) | $ (6.8)
Discrete tax expense for excess book deductions for equity-based compensation |  |  |  | 14.4 |
Discrete tax expense for excess book deductions for equity-based compensation |  | 14.4 | $ 11.0 |  | (5.2)
Tax expense for interest related to uncertain tax liabilities |  | 4.6 |  | 4.6 | 3.8
Discrete tax adjustments for certain state tax return to provision adjustments |  |  |  | (10.1) |
Tax expense for additional interest related to uncertain tax liabilities |  | 3.8 |  | 3.8 |
Discrete tax benefit for return to provision adjustments |  | $ (0.7) | $ (0.7) |  | (0.7)
Discrete tax adjustment for reduction in valuation allowance related to operations in France |  |  |  |  | (69.4)
Swiss Federal Tax Administration |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Discrete tax benefit for a withholding tax refund received from Switzerland |  |  |  | $ (13.2) |
Minimum | Internal Revenue Service (IRS) | 2018 Tax Year |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Unrecognized income tax expense due to change in tax regulations | $ 180.0 |  |  |  |
Maximum | Internal Revenue Service (IRS) | 2018 Tax Year |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Unrecognized income tax expense due to change in tax regulations | $ 220.0 |  |  |  |
FRANCE |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Discrete tax expense for excess book deductions for equity-based compensation |  |  |  |  | 11.0
Europe |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Tax expense for additional interest related to uncertain tax liabilities |  |  |  |  | 2.2
Tax expense related to tax audits in Europe |  |  |  |  | $ 26.1

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