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Accumulated Other Comprehensive Loss - Components of AOCI (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Cumulative translation adjustments $ (226.1) $ (210.8)
Market value of derivative financial instruments, net of tax (0.4) (17.8)
Accumulated other comprehensive income (loss) $ (226.5) $ (228.6)