Pension And Other Postretirement Benefits (Schedule Of Amounts Recognized In Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Pension Benefits [Member]
Liability, Defined Benefit Plan [Abstract]
Current accrued benefit cost	$ 1.3	$ 4.0
Non-current accrued benefit cost	107.3	140.8
Net amount recognized	108.6	144.8
Postretirement Benefits [Member]
Liability, Defined Benefit Plan [Abstract]
Current accrued benefit cost	6.5	6.8
Non-current accrued benefit cost	55.9	55.5
Net amount recognized	$ 62.4	$ 62.3