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Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
U.S. federal statutory rate | $ (7.0) | $ 108.4 | $ 236.2
U.S. federal statutory rate | 21.00% | 21.00% | 21.00%
Statutory tax rate difference between Australia and U.S. | $ 2.2 | $ 30.2 | $ 94.4
Statutory tax rate difference between Australia and U.S. | (6.60%) | 5.90% | 8.40%
Permanent difference - remeasurement | $ (6.8) | $ 21.6 | $ 2.6
Permanent difference - remeasurement | 20.30% | 4.20% | 0.20%
Remeasurement of foreign tax accounts | $ 2.5 | $ (5.7) | $ (0.9)
Remeasurement of foreign tax accounts | (7.50%) | (1.10%) | (0.10%)
Other Adjustments, Australia | $ 4.8 | $ (0.3) | $ (7.8)
Other Adjustments, Australia | (14.30%) | (0.10%) | (0.70%)
Deferred tax asset write-off due to liquidation | $ 15.0 | $ 0.0 | $ 0.0
Deferred tax asset write-off due to liquidation | (44.80%) | 0.00% | 0.00%
Change in Deferred Tax Assets Valuation Allowance, United Kingdom | $ (15.0) | $ 0.0 | $ 0.0
Change in Deferred Tax Assets Valuation Allowance, United Kingdom | 0.448 | 0 | 0
Other Adjustments, United Kingdom | $ (0.8) | $ 0.0 | $ 0.4
Other Adjustments, United Kingdom | 0.024 | 0 | 0
Changes in valuation allowance | $ 18.9 | $ (29.6) | $ 5.0
Changes in valuation allowance | (56.40%) | (5.70%) | 0.40%
Worldwide change in prior year unrecognized tax benefits | $ (1.1) | $ (6.9) | $ (1.5)
Worldwide change in prior year unrecognized tax benefits | 3.30% | (1.30%) | (0.10%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount | $ 3.5 | $ 2.0 | $ 3.0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent | (10.40%) | 0.40% | 0.30%
Excess U.S. depletion | $ (9.1) | $ (8.8) | $ (14.0)
Excess U.S. depletion | 27.20% | (1.70%) | (1.20%)
Other adjustments | $ 1.7 | $ (2.1) | $ (8.6)
Other adjustments | (5.30%) | (0.40%) | (0.70%)
Income tax provision | $ 8.8 | $ 108.8 | $ 308.8
Effective Income Tax Rate Reconciliation, Percent | (26.30%) | 21.20% | 27.50%

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