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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Pension liability adjustment, tax (provision) benefit $ 5.9 $ (9.8) $ 0.4
Net unrealized gains (losses) on qualifying cash flow edges, tax benefit (provision) $ 0.7 $ 0.4 $ (1.7)