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Accumulated Other Comprehensive Loss - Components Of Accumulated Other Comprehensive Loss (Detail) (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]        
Gain (Loss) on derivative instruments, tax $ 5.0 $ 2.4 $ 10.7 $ 5.6