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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2025

Income Tax Disclosure [Abstract]

Components of the provision for income taxes

The components of the provision for income taxes are as follows:

			Year Ended December 31,
			2025						2024						2023
			(in millions)
Current:
Federal			$	1.4					$	3.7					$	3.0
State			4.7						4.6						1.9
Foreign			0.8						2.8						—
Total current			6.9						11.1						4.9
Deferred:
Federal			30.7						15.1						25.0
State			(0.7)						6.4						4.1
Foreign			(4.0)						3.7						2.7
Total deferred			26.0						25.2						31.8
Provision			$	32.9					$	36.3					$	36.7

Reconciliation between the statutory U.S. federal income tax rate and the Company's effective income tax rate

The following is a reconciliation between the statutory U.S. federal income tax rate and the Company’s effective income tax rate on income before income taxes:

			Year Ended December 31,
			2025
			(in millions)
Federal statutory tax rate			$	50.7					21.0		%
State and local income taxes, net of federal income tax effect(1)			3.0						1.2
Foreign tax effects
Mexico
Currency adjustments			(7.3)						(3.0)
Nondeductible expenses			3.3						1.4
Other			(0.6)						(0.2)
Other foreign jurisdictions			0.2						0.1
Tax credits
AMP tax credits			(14.2)						(5.9)
Nontaxable or nondeductible items
Statutory depletion			(4.9)						(2.0)
Other			2.7						1.0
Effective rate			$	32.9					13.6		%

(1) State taxes in Tennessee, New Jersey, Kansas, California, Montana, Oklahoma, Arizona, Kentucky, Minnesota, Florida, New Mexico, Missouri, and Alabama made up a majority (greater than 50%) of the tax effect in this category.

									Year Ended December 31,
									2024						2023
Statutory rate									21.0		%				21.0		%
State taxes, including prior year true-ups									7.5						2.3
AMP tax credits									(8.2)						(3.5)
Statutory depletion									(3.2)						(2.1)
Changes in valuation allowances and reserves									(1.1)						1.8
Prior year true-ups									0.4						(0.5)
Foreign adjustments									1.5						1.8
Currency adjustments									4.8						(2.6)
Compensation related items									0.5						—
Divestiture-related non-deductible goodwill									3.3						—
Other, net									1.4						0.5
Effective rate									27.9		%				18.7		%

Income taxes paid, net of refunds

The income taxes paid, net of refunds, by the Company, including jurisdictions where income taxes paid, net of refunds, exceed 5 percent of the total income taxes paid, net of refunds, are as follows:

			Year Ended December 31,
			2025
			(in millions)
Federal			$	15.0
State and local
New Jersey			6.0
Iowa			(2.1)
California			1.6
Tennessee			1.5
Other			4.0
State and local			11.0
Foreign
Other			0.4
Foreign			0.4
Total income taxes paid, net of refunds			$	26.4

Components of deferred tax liabilities and assets

The components of deferred tax liabilities and assets are as follows:

			December 31,
			2025						2024
			(in millions)
Deferred tax liabilities:
Depreciation, depletion, and amortization			$	269.0					$	248.7
Total deferred tax liabilities			269.0						248.7
Deferred tax assets:
Workers compensation and other benefits			11.2						12.3
Tax carryforwards and credits			33.3						36.9
Inventory			3.4						6.1
Accrued liabilities and other			4.7						2.6
Total deferred tax assets			52.6						57.9
Net deferred tax assets (liabilities) before valuation allowances			(216.4)						(190.8)
Valuation allowances			7.2						7.0
Net deferred tax assets (liabilities)			$	(223.6)					$	(197.8)

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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