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Pension And Other Postretirement Benefits (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Pension And Other Postretirement Benefits [Abstract]
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
Employer contributions	$ 11,600,000	$ 11,800,000
Assets held in postretirement benefits plan	0		$ 0
Expected employer contributions remainder of year	$ 30,000,000.0

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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