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Accumulated Other Comprehensive Loss - Components Of Accumulated Other Comprehensive Loss (Detail) (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Accumulated Other Comprehensive Income Loss Net Of Tax [Abstract]    
Gain (Loss) on derivative instruments, tax $ (3.5) $ (7.3)