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Consolidated Statements of Equity (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Stockholders' Equity [Abstract]      
Retirement expense (benefit) plans funded status adjustment, tax $ 0.4 $ 0.3 $ (0.2)