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Savings, Pension and Other Postretirement Employee Benefit Plans - Multiemployer Defined Benefit Plans (Details) | 7 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2023 USD ($) $ / Hour | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multiemployer Plan, Pension, Significant, Employer Contribution, Cost |  | $ 5,800,000 | $ 5,700,000 | $ 5,700,000
Multiemployer Plan, Contribution Rate Increase (Decrease) |  | 2.50% |  |
Defined Benefit Plan, Number of Investment Options Holding Substantially All Pension Funds |  | 8 |  |
IAM |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multiemployer Plan, Pension, Significant, Surcharge [Fixed List] |  | No |  |
Multiemployer Plan, Pension, Significant, Plan Number |  | 002 |  |
Multiemployer Plan, Pension, Significant, Employer Contribution, Cost |  | $ 200,000 | $ 300,000 | 300,000
Multiemployer Plan, Pension, Significant, Collective-Bargaining Arrangement, Expiration Date |  | May 31, 2026 |  |
Multiemployer Plan, Pension, Significant, Certified Zone Status [Fixed List] |  | Red | Red |
USW |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multiemployer Plan, Pension, Significant, Surcharge [Fixed List] |  | No |  |
Multiemployer Plan, Pension, Significant, Plan Number |  | 001 |  |
Multiemployer Plan, Pension, Significant, Employer Contribution, Cost |  | $ 5,600,000 | $ 5,500,000 | $ 5,400,000
Multiemployer Plan, Pension, Significant, Collective-Bargaining Arrangement, Expiration Date |  | Aug. 31, 2025 |  |
Multiemployer Plan, Pension, Significant, Certified Zone Status [Fixed List] |  | Red | Red |
International Association Of Machinist Contribution Rate |  |  |  |
Retirement Benefits [Abstract] |  |  |  |
Contribution rates | $ / Hour |  | 4.00 |  |
United Steel Workers Contribution Rate |  |  |  |
Retirement Benefits [Abstract] |  |  |  |
Contribution rates | $ / Hour |  | 2.79 |  |
International Association Of Machinist Contribution Rate Additional Contribution |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Multiemployer Plan, Contribution Rate Increase (Decrease) | 2.50% | 13.30% |  |

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- Definition Increase (decrease) in employer's contractual contribution rate to multiemployer plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 80 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480576/715-80-50-6 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 80 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480576/715-80-50-11 + Details
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