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Condensed Consolidated Statements of Comprehensive Income/(Loss) (Unaudited) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Statement of Comprehensive Income [Abstract]        
Tax expense on interest rate swaps $ 0.2 $ (0.1) $ 0.6 $ 0.5
Tax expense on qualified pension and post-retirement healthcare plans $ 0.0 $ 1.2 $ 0.0 $ 2.4