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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%