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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2025
Income Tax Disclosure [Abstract]  
(Loss) income from continuing operations before income taxes
 Year Ended December 31,
202520242023
 (Dollars in millions)
U.S. $(62.7)$180.2 $77.8 
Non-U.S. 29.2 335.9 1,047.0 
(Loss) income from continuing operations before income taxes$(33.5)$516.1 $1,124.8 
Components of income tax provision (benefit)
Year Ended December 31,
202520242023
(Dollars in millions)
Current:
U.S. federal$(0.1)$(0.1)$(0.1)
Non-U.S. 25.6 96.7 225.9 
State— — 0.1 
Total current25.5 96.6 225.9 
Deferred: 
Non-U.S. (16.7)12.2 82.9 
Total deferred(16.7)12.2 82.9 
Income tax provision$8.8 $108.8 $308.8 
Reconciliation of the expected statutory federal income tax provision (benefit) to the Company's actual income tax provision
The following is a reconciliation of the expected income tax provision at the U.S. federal statutory rate to the Company’s income tax provision for the periods presented below:
 Year Ended December 31,
 202520242023
Amount%Amount%Amount%
 (Dollars in millions)
U.S. federal statutory rate$(7.0)21.0 %$108.4 21.0 %$236.2 21.0 %
Foreign tax effects:
Australia
Statutory tax rate difference between Australia and U.S.2.2 (6.6)%30.2 5.9 %94.4 8.4 %
Permanent difference - remeasurement(6.8)20.3 %21.6 4.2 %2.6 0.2 %
Remeasurement of foreign tax accounts2.5 (7.5)%(5.7)(1.1)%(0.9)(0.1)%
Other4.8 (14.3)%(0.3)(0.1)%(7.8)(0.7)%
United Kingdom
Deferred tax asset write-off due to liquidation15.0 (44.8)%— — %— — %
Change in valuation allowance(15.0)44.8 %— — %— — %
Other(0.8)2.4 %— — %0.4 — %
Changes in valuation allowance18.9 (56.4)%(29.6)(5.7)%5.0 0.4 %
Worldwide change in prior year unrecognized tax benefits(1.1)3.3 %(6.9)(1.3)%(1.5)(0.1)%
Nondeductible and nontaxable items3.5 (10.4)%2.0 0.4 %3.0 0.3 %
Other adjustments
Excess U.S. depletion(9.1)27.2 %(8.8)(1.7)%(14.0)(1.2)%
Other, net1.7 (5.3)%(2.1)(0.4)%(8.6)(0.7)%
Total income tax provision$8.8 (26.3)%$108.8 21.2 %$308.8 27.5 %
Tax effects of temporary differences that give rise to significant portions of the deferred tax assets and liabilities
The tax effects of temporary differences that gave rise to significant portions of the deferred tax assets and liabilities as of December 31, 2025 and 2024 consisted of the following:
December 31,
 20252024
 (Dollars in millions)
Deferred tax assets:  
Tax loss carryforwards and credits$808.2 $732.5 
Property, plant, equipment and mine development, principally due to differences in depreciation, depletion and asset impairments
539.0 523.2 
Accrued postretirement benefit obligations29.3 33.7 
Asset retirement obligations108.8 102.4 
Employee benefits19.3 19.7 
Take-or-pay obligations5.9 5.5 
Investments and other assets28.6 32.6 
Workers’ compensation obligations9.3 8.4 
Operating lease liabilities29.5 29.0 
Other38.6 33.0 
Total gross deferred tax assets1,616.5 1,520.0 
Valuation allowance(1,469.2)(1,420.9)
Total net deferred tax assets147.3 99.1 
Deferred tax liabilities:  
Property, plant, equipment and mine development, principally due to differences in depreciation, depletion and asset impairments
123.7 95.5 
Operating lease right-of-use assets28.9 29.1 
Investments and other assets18.8 15.4 
Total deferred tax liabilities171.4 140.0 
Net deferred tax liability$(24.1)$(40.9)
Deferred taxes are classified as follows on the Consolidated Balance Sheets:  
Noncurrent deferred income tax asset$2.2 $— 
Noncurrent deferred income tax liability$(26.3)$(40.9)
Schedule of Unrecognized Tax Benefits Roll Forward A reconciliation of the beginning and ending amount of gross unrecognized tax benefits for the periods presented below is as follows:
 Year Ended December 31,
 202520242023
(Dollars in millions)
Balance at beginning of period$9.2 $8.7 $9.5 
Additions for current year tax positions1.1 1.4 0.9 
(Reductions) additions for prior year tax positions(1.1)0.4 (1.7)
Reductions for expirations of statutes limitations— (1.3)— 
Balance at end of period$9.2 $9.2 $8.7 
Summary of Company tax (refunds) payments
The following table summarizes the Company’s income tax payments, net for the periods presented below:
 Year Ended December 31,
 202520242023
 (Dollars in millions)
U.S. — federal$(0.1)$(0.1)$(0.2)
U.S. — state and local— — 0.1 
Australia26.1 222.6 130.7 
Total income tax payments, net$26.0 $222.5 $130.6