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Pension and Savings Plans - Textual (Details) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 01, 2025 | Dec. 31, 2024 USD ($) numberOfPlan | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jan. 31, 2025 USD ($) | Mar. 31, 2022 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan, Funding Status |  | $ 11,100,000 |  |  |  |
Liability for Future Policy Benefits, Individual and Group Annuities and Supplementary Contracts |  |  |  |  |  | $ 500,000,000
Subsequent Event |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined Benefit Plan Termination, Final Contribution Amount |  |  |  |  | $ 5,000,000 |
Pension Benefit Guaranty Corporation | Subsequent Event |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Release of a letter of credit |  |  |  |  | $ 37,000,000 |
Pension Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Settlement gain |  | 0 | $ 2,200,000 | $ 0 |  |
Net actuarial gain |  | $ 1,900,000 | $ 0 | $ 20,600,000 |  |
Expected long-term return on plan assets |  | 4.40% | 4.85% | 3.20% |  |
Accumulated benefit obligation |  | $ 117,600,000 | $ 125,200,000 |  |  |
Defined benefit plan, assets |  | 104,800,000 | 116,000,000.0 | $ 583,300,000 |  |
Peabody Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Defined benefit plan, assets |  | 0 |  |  |  |
Plan with accumulated benefit obligation in excess of plan assets, accumulated benefit obligation |  | $ 0 |  |  |  |
Western Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Expected long-term return on plan assets |  | 4.40% |  |  |  |
Defined benefit plan, assets |  | $ 104,800,000 | 116,000,000 |  |  |
401(k) plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Number of 401(k) plans | numberOfPlan |  | 3 |  |  |  |
Paid discretionary contributions to defined contribution pension plans, company match |  | $ 21,700,000 | 21,300,000 | 20,100,000 |  |
Discretionary contributions to defined contribution pension plans, granted |  | 7,800,000 | 7,300,000 | 9,200,000 |  |
Payment of discretionary contributions |  | 7,700,000 | 4,600,000 | 4,000,000.0 |  |
Superannuation |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Paid discretionary contributions to defined contribution pension plans, company match |  | 25,700,000 | 21,900,000 | 18,800,000 |  |
Discretionary contributions to defined contribution pension plans, granted |  | 2,200,000 | 1,600,000 | 1,600,000 |  |
Discretionary contributions to defined contribution pension plans, paid |  | $ 1,900,000 | $ 1,300,000 | $ 0 |  |
Fixed Income Investments |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Plan assets, target allocation, percentage |  | 100.00% | 100.00% |  |  |
Scenario, Forecast | Western Plan |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Expected long-term return on plan assets | 4.95% |  |  |  |  |

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