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Income Taxes - Reconciliation between Provision for Income Taxes at Statutory Rate and Provision for Income Taxes at Effective Tax Rate (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Income Tax Disclosure [Abstract] |  |  |
Tax expense at United States statutory rate | $ 35.6 | $ 42.6 | $ 89.2
Increase (decrease) in tax resulting from: |  |  |
Differences between U.S. and foreign tax rates on foreign income, including withholding taxes | 30.2 | 90.3 | (21.5)
U.S. tax expense (benefit) on foreign income, net of foreign tax credits | (12.0) | 1.1 | (4.7)
Intra-entity transfers of intellectual property | (177.6) | 0.0 | 0.0
Deferred tax charge | 18.5 | (7.4) | 0.0
Increase (decrease) in valuation allowances | 28.8 | (61.0) | 24.7
State taxes, net of federal benefit | (2.2) | (5.6) | 3.9
Unrecognized tax (benefits) expenses | (13.8) | (6.1) | 7.5
Excess tax expense (benefits) on equity awards | 6.5 | 5.2 | 0.6
U.S. research and development tax credit | (4.9) | (4.4) | (2.4)
Expenses not deductible for tax | 6.3 | 3.2 | 4.0
Other | 0.3 | 2.9 | 2.2
Total | $ (84.9) | $ 60.8 | $ 103.5

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