Pension And Other Postretirement Benefits (Schedule Of Amounts Recognized In Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Pension Benefits
Liability, Defined Benefit Plan [Abstract]
Current accrued benefit cost	$ 1.9	$ 2.1
Non-current accrued benefit cost	197.9	164.6
Net amount recognized	199.8	166.7
Postretirement Benefits
Liability, Defined Benefit Plan [Abstract]
Current accrued benefit cost	6.8	6.8
Non-current accrued benefit cost	74.1	69.4
Net amount recognized	$ 80.9	$ 76.2