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Pension and Postretirement Benefit Plans (Net Pension And Postretirement Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Pension benefits          
Defined Benefit Plan Disclosure [Line Items]          
Service cost $ 3.7 $ 4.0 $ 7.8 $ 8.0  
Interest cost 3.2 4.1 6.4 8.2  
Expected return on plan assets (7.9) (7.0) (15.7) (14.1)  
Amortization of net actuarial losses 3.4 3.2 7.4 6.6  
Amortization of prior service cost 0.1 0.6 0.6 1.1  
Curtailment 0.0 0.0 (1.2) 0.0  
Net periodic pension cost 2.5 4.9 5.3 9.8  
Postretirement benefits          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 0.0 0.0 0.1 0.0  
Interest cost 0.2 0.3 0.4 0.6  
Amortization of net actuarial losses 0.0 0.0 0.0 0.1  
Amortization of prior service cost 0.0 0.1 0.0 0.1  
Net periodic pension cost $ 0.2 $ 0.4 $ 0.5 $ 0.8  
ENPP          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Minimum Age to Receive Benefits         65 years