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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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Equity [Abstract]        
Foreign currency translation adjustments $ 0.1 $ (8.4) $ (0.1) $ (0.5)
Unrecognized pension and postretirement costs 3.7 4.0 7.5 8.0
Derivative financial instruments (0.1) (9.8) 2.2 (10.0)
Income tax (provision) benefit related to OCI $ 3.7 $ (14.2) $ 9.6 $ (2.5)