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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]        
Gain on derivative instruments, tax $ 0.0 $ (8.0) $ 0.1 $ 8.0