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Other Commitments And Contingencies (Restructuring) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve $ 11.1 $ 0.0
Restructuring Reserve, Period Increase (Decrease) 33.5  
Payments for Restructuring (21.2)  
Restructuring Reserve, Accrual Adjustment $ (1.2)