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Employee Benefit Plans (Components Of Net Pension (Expense) Income) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Retirement Benefits [Abstract]      
Service cost $ (5.1) $ (4.0) $ (3.9)
Interest cost (7.2) (8.5) (8.0)
Expected return on plan assets 11.9 11.3 11.9
Recognized net actuarial loss (4.0) (2.9) (2.6)
Prior service cost 0.4 (1.7) 0.0
Net pension expense $ (4.0) $ (5.8) $ (2.6)
Weighted average assumptions for pension costs:      
Discount rate used in net pension costs 2.80% 3.90% 3.40%
Rate of compensation increase used in pension costs 3.40% 3.00% 3.00%
Expected return on plan assets 6.10% 6.40% 6.40%
Weighted average assumptions for benefit obligation:      
Discount rate used in benefit obligation 2.10% 2.80% 3.90%
Rate of compensation increase used in benefit obligation 3.50% 3.40% 3.00%