Pension And Postretirement Benefits (Schedule Of Amounts Recognized In Consolidated Balance Sheets) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Accrued pension and postretirement benefits	$ (329.7)	$ (298.4)
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	62.6	64.8
Current liabilities	(1.5)	(1.4)
Accrued pension and postretirement benefits	(296.8)	(266.3)
Amounts recognized in the Consolidated Balance Sheets	(235.7)	(202.9)
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	0.0	0.0
Current liabilities	(2.6)	(2.2)
Accrued pension and postretirement benefits	(27.4)	(26.8)
Amounts recognized in the Consolidated Balance Sheets	$ (30.0)	$ (29.0)