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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]      
Adjustment to pension liability, tax $ 0.5 $ (3.4) $ (2.0)
Derivative instruments accounted for as hedges, tax $ (2.4) $ (0.9) $ (0.8)