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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,
			2025						2024						2023
			(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,
			2025						2024						2023
			(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 current			25.5						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,
			2025									2024									2023
			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 accounts			2.5			(7.5)		%				(5.7)			(1.1)		%				(0.9)			(0.1)		%
Other			4.8			(14.3)		%				(0.3)			(0.1)		%				(7.8)			(0.7)		%
United Kingdom
Deferred tax asset write-off due to liquidation			15.0			(44.8)		%				—			—		%				—			—		%
Change in valuation allowance			(15.0)			44.8		%				—			—		%				—			—		%
Other			(0.8)			2.4		%				—			—		%				0.4			—		%
Changes in valuation allowance			18.9			(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 items			3.5			(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, net			1.7			(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,
			2025						2024
			(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 obligations			29.3						33.7
Asset retirement obligations			108.8						102.4
Employee benefits			19.3						19.7
Take-or-pay obligations			5.9						5.5
Investments and other assets			28.6						32.6
Workers’ compensation obligations			9.3						8.4
Operating lease liabilities			29.5						29.0
Other			38.6						33.0
Total gross deferred tax assets			1,616.5						1,520.0
Valuation allowance			(1,469.2)						(1,420.9)
Total net deferred tax assets			147.3						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 assets			28.9						29.1
Investments and other assets			18.8						15.4
Total deferred tax liabilities			171.4						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,
			2025						2024						2023
			(Dollars in millions)
Balance at beginning of period			$	9.2					$	8.7					$	9.5
Additions for current year tax positions			1.1						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,
			2025						2024						2023
			(Dollars in millions)
U.S. — federal			$	(0.1)					$	(0.1)					$	(0.2)
U.S. — state and local			—						—						0.1
Australia			26.1						222.6						130.7
Total income tax payments, net			$	26.0					$	222.5					$	130.6

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Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

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Tabular disclosure of income before income tax between domestic and foreign jurisdictions.

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