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Other Postretirement Employee Benefit Plans (Components Of Net Periodic Benefit Cost) (Details) - Other postretirement benefits - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ (0.5) $ (0.7) $ (0.7)
Interest cost (5.3) (5.6)  
Amortization of net gain 0.0 0.1  
Amortization of prior service (cost) credit 2.5 3.1  
Net periodic pension benefit (cost) $ (3.3) $ (3.1) $ (4.2)