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Accumulated Other Comprehensive Loss - Schedule of Income Tax (Provision) Benefit Allocated to Components of OCI (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Equity [Abstract]    
Foreign currency translation adjustments $ (0.2) $ 7.9
Unrecognized pension and postretirement costs 3.8 4.0
Derivative financial instruments 2.3 (0.2)
Income tax benefit related to AOCL $ 5.9 $ 11.7