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Consolidated Statements of Comprehensive Income (Loss) Parenthetical (Parentheticals) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Comprehensive Income (Loss), Tax, Parenthetical Disclosures [Abstract]      
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax $ (9.8) $ 3.4 $ 4.7
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax $ 0.5 $ (0.2) $ 0.0