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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]      
Loss (gain) of pension and post retirement benefit plan adjustments $ 3.5 $ 3.1 $ (3.6)
Share of affiliated comprehensive (income) loss $ 17.7 $ 3.3 $ 24.3