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Employee Benefit Plans (Narrative) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Defined Contribution Plan, Cost | $ 24.7 | $ 27.7 | $ 23.6
Trading securities fair value | 98.6 | $ 82.6 |
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 | $ 358.7 | $ 350.3 |
Excess of pension plan assets over the projected benefit obligation | $ 16.3 | 7.9 |
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 | $ 16.6 | 19.0 |
Total obligation | $ 13.5 | $ 15.7 |

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- Definition Defined Benefit Plan Funding Goal Percentage + References No definition available. + Details
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- Definition Minimum period the individual is required to perform services to be fully vested under the deferred compensation arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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