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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME      
(Increase) decrease in pension and other post-retirement benefits, income tax $ 2.6 $ 0.8 $ (1.4)