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Employee Benefit Plans (Net Pension And Postretirement Cost) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Pension plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 15.0 $ 16.2 $ 15.5
Interest cost 12.6 16.5 20.7
Expected return on plan assets (31.3) (28.4) (28.1)
Amortization of net actuarial losses 16.5 15.5 14.3
Amortization of prior service cost 0.7 2.1 1.6
Net loss recognized due to settlement 0.1 0.2 0.5
Curtailment gain (1.2) 0.0 0.0
Net annual cost $ 12.4 $ 22.1 $ 24.5
Weighted average discount rate 1.50% 2.00% 2.80%
Postretirement benefits      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 0.1 $ 0.1 $ 0.1
Interest cost 0.9 1.2 1.3
Amortization of net actuarial losses 0.1 0.1 0.0
Amortization of prior service cost 0.1 0.1 0.1
Net annual cost $ 1.2 $ 1.5 $ 1.5
Weighted average discount rate 3.80% 4.50% 5.20%
ENPP      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, minimum age to receive benefits 65 years