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Income Tax Provision (Tables)

12 Months Ended

Dec. 31, 2024

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax, Domestic and Foreign

Income (loss) from operations before income taxes, based on geographic location of the operations to which such earnings are attributable, is provided below.

		Years Ended December 31,
		2024				2023				2022
United States		$	4.5			$	103.2			$	108.5
Non-United States			0.1				(6.8	)			(11.4	)
Income (loss) from operations before income taxes		$	4.6			$	96.4			$	97.1

Schedule of (Benefit) Provision for Income Taxes

The provision (benefit) for income taxes consisted of the following:

		Years Ended December 31,
		2024				2023				2022
Current:
Federal		$	2.6			$	30.4			$	0.6
State and local			(0.1	)			6.1				5.7
Foreign			0.3				0.2				0.8
Total current tax expense (benefit)		$	2.8			$	36.7			$	7.1
Deferred:
Federal		$	0.4			$	(9.2	)		$	24.2
State and local			0.1				(0.5	)			0.7
Foreign			—				—				—
Total deferred tax expense (benefit)			0.5				(9.7	)			24.9
Provision (benefit) for incomes taxes		$	3.3			$	27.0			$	32.0

Schedule of Effective Income Tax Rate Reconciliation

The reconciliation between Metallus' effective tax rate on income (loss) from continuing operations and the statutory tax rate is as follows:

		Years Ended December 31,
		2024				2023				2022
U.S. federal income tax provision (benefit) at statutory rate		$	1.0			$	20.2			$	20.4
Adjustments:
State and local income taxes, net of federal tax benefit			—				4.2				8.4
Permanent differences			1.9				1.2				8.9
Foreign earnings taxed at different rates			0.1				—				(3.6	)
Valuation allowance			(0.5	)			1.8				(2.5	)
U.S. research tax credit			(0.1	)			(0.3	)			(0.6	)
Other items, net			1.0				(0.1	)			1.0
Provision (benefit) for income taxes		$	3.3			$	27.0			$	32.0
Effective tax rate			72.2	%			28.0	%			32.9	%

Schedule of Deferred Tax Assets and Liabilities

The effect of temporary differences giving rise to deferred tax assets and liabilities at December 31, 2024 and 2023 was as follows:

		Years Ended December 31,
		2024				2023
Deferred tax liabilities:
Depreciation		$	(69.5	)		$	(75.0	)
Inventory			—				—
Prepaid insurance			(1.3	)			(1.9	)
Leases - right-of-use asset			(2.8	)			(2.8	)
Deferred tax liabilities		$	(73.6	)		$	(79.7	)
Deferred tax assets:
Tax loss carryforwards		$	15.6			$	16.0
Pension and postretirement benefits			41.2				46.8
Other employee benefit accruals			8.4				8.0
Lease liability			2.8				2.8
State decoupling			1.2				1.2
Capital loss carryforward			0.8				0.8
Intangible assets			0.1				0.1
Inventory			0.8				0.8
Allowance for doubtful accounts			0.4				0.5
Capitalized R&D			3.0				3.2
Other, net			—				—
Deferred tax assets subtotal		$	74.3			$	80.2
Valuation allowances			(15.0	)			(15.5	)
Deferred tax assets			59.3				64.7
Net deferred tax assets (liabilities)		$	(14.3	)		$	(15.0	)

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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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

+ References

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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 740
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-Name Accounting Standards Codification
-Section 55
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482663/740-10-55-231

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

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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