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Employee Benefit Plans (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Defined Contribution Plan, Cost | $ 19,700,000 | $ 18,300,000 | $ 24,700,000
Trading securities fair value | 101,300,000 | $ 84,500,000 |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | $ 16,900,000 |  |
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 | 4.75% | 4.00% | 4.00%
Years of service for vesting eligibility | 3 years |  |
Accumulated benefit obligation | $ 323,200,000 | $ 294,400,000 |
Excess of pension plan assets over the projected benefit obligation | $ 700,000 | (15,300,000) |
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] |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 50.00% |  |
Other Postretirement Benefits Plan [Member] |  |  |
Fair value of assets | $ 10,800,000 | 12,000,000 |
Total obligation | $ 8,700,000 | $ 10,300,000 |

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- Definition Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Cash Balance Interest Crediting Rate + References No definition available. + Details
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- Definition Defined Benefit Plan Funding Goal Percentage + References No definition available. + Details
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- Definition Eligible age to participate in benefit plan + 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 -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 55 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482943/710-10-55-7 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480535/715-20-45-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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