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Pension and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Pension |  |
Pension and Other Postretirement Benefit Plans [Line Items] |  |
Employer contributions | $ 25.0 | $ 6.5
Expected future employer contributions | 0.0 |
Other Postretirement |  |
Pension and Other Postretirement Benefit Plans [Line Items] |  |
Employer contributions | 0.0 | $ 0.0
Expected future employer contributions | $ 0.0 |

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- Definition Amount of contribution expected to be received by defined benefit plan from employer in remainder of current fiscal year. Excludes contribution previously paid by employer in current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-18 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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