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Employee Benefit Plans (Net Pension And Postretirement Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Pension Benefits      
Service cost $ 16.2 $ 15.5 $ 16.6
Interest cost 16.5 20.7 19.9
Expected return on plan assets (28.4) (28.1) (34.0)
Amortization of net actuarial losses 15.5 14.3 13.8
Amortization of prior service cost 2.1 1.6 1.2
Net loss recognized due to settlement 0.2 0.5 0.9
Net annual pension cost $ 22.1 $ 24.5 $ 18.4
Weighted average discount rate 2.00% 2.80% 2.50%
Other Postretirement Benefits Plan [Member]      
Service cost $ 0.1 $ 0.1 $ 0.1
Interest cost 1.2 1.3 1.4
Amortization of net actuarial losses 0.1 0.0 0.1
Amortization of prior service cost 0.1 0.1 0.2
Net annual pension cost $ 1.5 $ 1.5 $ 1.8
Weighted average discount rate 4.50% 5.20% 4.90%