Pension And Other Postretirement Benefits (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Vesting percentage			100.00%
Required term of service to be eligible for plan match			one year of service and 1,000 hours of service
Award vesting period			3 years
Non-cash pension settlement charge			$ 16.7	$ 17.7
Employer contributions	$ 10.0	$ 20.0	31.6	41.8
Expected employer contributions remainder of year	10.0		10.0
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Non-cash pension settlement charge	$ 16.7	$ 17.7	$ 16.7	$ 17.7