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Income Taxes - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Unrecognized tax benefits—beginning of year $ 88.0 $ 83.5 $ 87.5
Gross additions—current year tax positions 7.2 9.2 9.1
Gross additions—prior year tax positions 3.7 2.9 9.3
Gross additions (reductions)—purchase accounting adjustments 12.1   1.0
Gross reductions—prior year tax positions (11.7) (6.9) (14.5)
Gross reductions—settlements with taxing authorities (3.2) (0.7) (8.9)
Unrecognized tax benefits—end of year $ 96.1 $ 88.0 $ 83.5