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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]      
Unrealized (losses) gains on derivatives, tax $ (0.5) $ 0.9 $ (1.4)
Defined benefit plans, tax $ (0.2) $ 3.8 $ 0.9