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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Beginning balance of unrecognized tax benefits | $ 50.6 | $ 50.5 | $ 49.4
Additions for current year tax positions | 12.8 | 13.0 | 9.3
Additions for prior year tax positions | 0.7 | 3.6 | 2.0
Reductions for prior year tax positions | (2.1) | (6.0) | (4.7)
Reductions for audit settlements | (0.5) | (7.1) |
Reductions for the expiration of statutes of limitations | (4.8) | (6.2) | (4.2)
Changes due to foreign currency translation adjustments | (3.2) | 2.8 | (1.3)
Ending balance of unrecognized tax benefits (excluding interest and penalties) | 53.5 | 50.6 | 50.5
Interest and penalties associated with unrecognized tax benefits | 11.7 | 11.4 | 11.5
Ending balance of unrecognized tax benefits (including interest and penalties) | $ 65.2 | $ 62.0 | $ 62.0

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