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Schedule of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Stockholders' Equity [Abstract]    
Cumulative foreign currency translation adjustments $ (26.5) $ (79.2)
Unrealized net (loss) gain on cash flow derivative instruments less related income tax benefit (provision) of $0.6 in 2017 and $(0.1) in 2016 (0.9) 0.2
Pension liability less related income tax benefit of $175.9 in 2017 and $183.4 in 2016 (272.1) (284.2)
Accumulated other comprehensive loss $ (299.5) $ (363.2)