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Pension and Postretirement Benefit Plans (Net Pension And Postretirement Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Pension benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 3.7 $ 4.0 $ 11.5 $ 12.0
Interest cost 3.3 4.1 9.7 12.3
Expected return on plan assets (8.0) (7.1) (23.7) (21.2)
Amortization of net actuarial losses 3.3 3.4 10.7 10.0
Amortization of prior service cost 0.0 0.5 0.6 1.6
Curtailment 0.0 0.0 (1.2) 0.0
Net periodic pension cost 2.3 4.9 7.6 14.7
Postretirement benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0.0 0.0 0.1 0.0
Interest cost 0.2 0.3 0.6 0.9
Amortization of net actuarial losses 0.1 0.1 0.1 0.2
Amortization of prior service cost 0.1 0.0 0.1 0.1
Net periodic pension cost $ 0.4 $ 0.4 $ 0.9 $ 1.2
ENPP        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, minimum age to receive benefits 65 years   65 years