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Income Taxes - Changes Occurred in Amount of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Abstract] |  |  |
Beginning balance of unrecognized tax benefits | $ 49.7 | $ 54.1 | $ 52.7
Additions for current year tax positions | 9.7 | 8.8 | 9.2
Additions for prior year tax positions | 1.0 | 2.2 | 5.1
Reductions for prior year tax positions | (6.6) | (3.7) | (2.3)
Reductions for audit settlements | (0.2) | (1.8) | (5.2)
Reductions for the expiration of statutes of limitations | (4.4) | (6.2) | (4.1)
Changes due to foreign currency translation adjustments | (0.1) | (3.7) | (1.3)
Ending balance of unrecognized tax benefits (excluding interest and penalties) | 49.1 | 49.7 | 54.1
Interest and penalties associated with unrecognized tax benefits | 18.3 | 22.8 | 18.4
Ending balance of unrecognized tax benefits (including interest and penalties) | $ 67.4 | $ 72.5 | $ 72.5

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