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Equity - Schedule of Components of Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Equity [Abstract]    
Derivative instrument fair market value, tax $ 0.0 $ 0.3
Employee pension and postretirement benefit adjustments, tax $ 13.5 $ 14.9