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Employee Benefit Plans (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Defined Contribution Plan, Cost	$ 18.3	$ 24.7	$ 27.7
Trading securities fair value	84.5	$ 98.6
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year	$ 0.0
Pension Plan [Member]
Age for participation eligibility in benefit plan	21
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Cash Balance Interest Crediting Rate	4.00%	4.00%	4.00%
Years of service for vesting eligibility	3 years
Accumulated benefit obligation	$ 294.4	$ 358.7
Excess of pension plan assets over the projected benefit obligation	$ 15.3	16.3
Percentage of employees base salary matched by employer, maximum	3.00%
Defined Benefit Plan Funding Goal Percentage	100.00%
Defined Benefit Plan Funding Goal Percentage	100.00%
Pension Plan [Member] | Fixed Income Funds [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	50.00%
Pension Plan [Member] | US Equity [Member] | Minimum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	15.00%
Pension Plan [Member] | US Equity [Member] | Maximum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	45.00%
Pension Plan [Member] | Foreign equity [Member] | Minimum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	10.00%
Pension Plan [Member] | Foreign equity [Member] | Maximum [Member]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	30.00%
Other Postretirement Benefits Plan [Member]
Fair value of assets	$ 12.0	16.6
Total obligation	$ 10.3	$ 13.5

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