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Other Postretirement Employee Benefit Plans (Funded Status Of The Domestic Plans) (Details) - Other postretirement benefits - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Change in benefit obligation:      
Benefit obligation at beginning of year $ (141.6) $ (155.1)  
Service cost (0.4) (0.4) $ (0.7)
Interest cost (5.3) (5.0)  
Amendments, curtailments and other (0.1) (5.3)  
Actuarial (loss) gain (4.2) 8.4  
Retiree contributions (1.7) (2.6)  
Benefits paid 14.4 18.4  
Benefit obligation at end of year (138.9) (141.6) $ (155.1)
Change in plan assets:      
Fair value of plan assets 0.0 0.0  
Funded status $ (138.9) $ (141.6)