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Accumulated Other Comprehensive Loss - Schedule of Income Tax Allocated to Components of Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Equity [Abstract]        
Foreign currency translation adjustments $ 2.9   $ 1.1  
Unrecognized pension and postretirement costs (1.4) $ (1.0) (2.7) $ (2.3)
Derivative financial instruments 2.2 (3.0) 6.6 31.9
Income tax (provision) benefit related to OCI $ 3.7 $ (4.0) $ 5.0 $ 29.6