Employee Benefit Plans (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate assumed	8.00%
Ultimate trend rate	4.50%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations (percent)	15.00%
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations (percent)	85.00%
Defined benefit pension plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation of pension plans	$ 170,000,000.0	$ 202,300,000
Weighted-average interest credit rate (as percent)	4.25%	4.25%
Discount rate increased plan obligations	$ (8,900,000)
Pension contributions planned for next fiscal year	0
Other postretirement benefits payments	16,800,000	$ 17,100,000	$ 17,500,000
Other postretirement benefits plan
Defined Benefit Plan Disclosure [Line Items]
Discount rate increased plan obligations	(4,000,000.0)
Health care cost trend assumption	(6,300,000)
Claims cost assumption	$ (7,100,000)