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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Foreign currency translation:    
Tax expense $ 5.9 $ 0.0
Pension and post-retirement plans:    
Tax expense 0.0 0.5
Tax expense, reclassification 0.0 0.0
Derivative financial instruments:    
Tax expense 1.8 0.0
Tax expense, reclassification $ 0.0 $ 0.0