Pension and Postretirement Benefits (Schedule Of Information For Pension Plans With An Accumulated Benefit Obligation In Excess Of Plan Assets) (Details) - Pension Benefits - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 771.6	$ 1,060.4
Accumulated benefit obligation	720.1	1,049.5
Fair value of plan assets	$ 525.2	$ 762.5