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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Statement of Comprehensive Income [Abstract]        
Defined benefit pension and other postretirement plan adjustments, tax $ 0.4 $ 0.1 $ 0.6 $ 0.9
Net (losses) gains on derivatives, tax $ 0.7 $ (0.4) $ 0.5 $ 0.8