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Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) (Unaudited) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]        
Unrealized gain (loss) on derivatives, net of income tax provision $ 0.0 $ 0.0 $ 0.0 $ 0.0
Employee pension and post retirement benefits costs, net of income tax benefit (provision) 0.0 0.0 0.0 0.0
Foreign currency translation adjustments, net of income tax provision (benefit) $ (0.2) $ (0.1) $ 2.5 $ (3.9)