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Income Taxes (Tables)
 12 Months Ended
Dec. 31, 2024
Income Tax Disclosure [Abstract]  
Income from continuing operations before income taxes
Income from continuing operations before income taxes for the periods presented below consisted of the following:
 Year Ended December 31,
 202420232022
 (Dollars in millions)
U.S. $180.2 $77.8 $59.7 
Non-U.S. 335.9 1,047.0 1,218.9 
Total$516.1 $1,124.8 $1,278.6 
Components of income tax provision (benefit)
Total income tax provision (benefit) for the periods presented below consisted of the following:
 Year Ended December 31,
 202420232022
 (Dollars in millions)
Current:
U.S. federal$(0.1)$(0.1)$(0.2)
Non-U.S. 96.7 225.9 42.9 
State— 0.1 0.1 
Total current96.6 225.9 42.8 
Deferred: 
Non-U.S. 12.2 82.9 (81.6)
Total deferred12.2 82.9 (81.6)
Total income tax provision (benefit)$108.8 $308.8 $(38.8)
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 statutory federal income tax expense to the Company’s income tax provision (benefit) for the periods presented below:
 Year Ended December 31,
 202420232022
 (Dollars in millions)
Expected income tax expense at U.S. federal statutory rate$108.4 $236.2 $268.5 
Changes in valuation allowance, income tax(19.6)(11.1)(595.6)
Changes in tax reserves0.5 (0.8)(1.5)
Excess depletion(10.2)(15.0)(17.2)
Foreign earnings repatriation— — 42.3 
Foreign earnings provision differential46.0 91.6 80.7 
Global intangible low-taxed income— — 197.2 
Remeasurement of foreign income tax accounts(5.7)(0.9)(2.6)
State income taxes, net of federal tax benefit(12.5)6.3 1.1 
Other, net1.9 2.5 (11.7)
Total income tax provision (benefit)$108.8 $308.8 $(38.8)
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, 2024 and 2023 consisted of the following:
December 31,
 20242023
 (Dollars in millions)
Deferred tax assets:  
Tax loss carryforwards and credits$732.5 $745.6 
Property, plant, equipment and mine development, principally due to differences in depreciation, depletion and asset impairments
523.2 550.1 
Accrued postretirement benefit obligations33.7 38.6 
Asset retirement obligations102.4 99.1 
Employee benefits19.7 20.1 
Take-or-pay obligations5.5 6.7 
Investments and other assets32.6 40.8 
Workers’ compensation obligations8.4 7.3 
Operating lease liabilities29.0 17.2 
Other33.0 30.6 
Total gross deferred tax assets1,520.0 1,556.1 
Valuation allowance(1,420.9)(1,473.5)
Total net deferred tax assets99.1 82.6 
Deferred tax liabilities:  
Property, plant, equipment and mine development, principally due to differences in depreciation, depletion and asset impairments
95.5 84.9 
Operating lease right-of-use assets29.1 16.3 
Investments and other assets15.4 10.0 
Total deferred tax liabilities140.0 111.2 
Net deferred tax liability$(40.9)$(28.6)
Deferred taxes are classified as follows:  
Noncurrent deferred income tax liability$(40.9)$(28.6)
Summary of Income Tax Contingencies
Net unrecognized tax benefits (excluding interest and penalties) were recorded as follows in the consolidated balance sheets as of December 31, 2024 and 2023:
December 31,
 20242023
(Dollars in millions)
Deferred income taxes$9.2 $7.4 
Other noncurrent liabilities— 1.3 
Net unrecognized tax benefits$9.2 $8.7 
Gross unrecognized tax benefits$9.2 $8.7 
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,
 202420232022
(Dollars in millions)
Balance at beginning of period$8.7 $9.5 $11.0 
Additions for current year tax positions1.4 0.9 0.8 
Additions (reductions) for prior year tax positions0.4 (1.7)(2.3)
Reductions for expirations of statutes limitations(1.3)— — 
Balance at end of period$9.2 $8.7 $9.5 
Summary of Company tax (refunds) payments
The following table summarizes the Company’s income tax payments, net for the periods presented below:
 Year Ended December 31,
 202420232022
 (Dollars in millions)
U.S. — federal$(0.1)$(0.2)$(0.3)
U.S. — state and local— 0.1 — 
Non-U.S. 222.6 130.7 36.9 
Total income tax payments, net$222.5 $130.6 $36.6