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Postretirement Health Care and Life Insurance Benefits - Reconciliation of Postretirement Plans' Funded Status to the Balance Sheet (Details) - Postretirement Health Care and Life Insurance Benefits - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Change in benefit obligation: |  |  |
Projected benefit obligation at beginning of period | $ 189.9 | $ 258.7 |
Service cost | 0.5 | 0.8 | $ 1.0
Interest cost | 10.2 | 7.0 | 10.5
Benefits Paid and Administrative Fees | (20.9) | (21.2) |
Actuarial gain | (1.7) | (55.4) |
Projected benefit obligation at end of period | 178.0 | 189.9 | 258.7
Change in plan assets: |  |  |
Fair value of plan assets at beginning of period | 17.4 | 26.1 |
Actual return on plan assets | 1.5 | (3.4) |
Employer contributions | 16.3 | 15.9 |
Benefits paid and administrative fees (net of Medicare Part D reimbursements) | (20.9) | (21.2) |
Fair value of plan assets at end of period | 14.3 | 17.4 | $ 26.1
Funded status at end of period | (163.7) | (172.5) |
Less: Current portion (included in “Accounts payable and accrued expenses”) | 15.3 | 16.0 |
Noncurrent obligation (included in “Other noncurrent liabilities”) | $ (148.4) | $ (156.5) |

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480266/715-60-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(6) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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