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Restructuring Charges	9 Months Ended
	Sep. 30, 2025
Restructuring and Related Activities [Abstract]
Restructuring Charges	Note 6 - Restructuring Charges During the third quarter of 2025, the Company offered an exit incentive program to certain retirement-eligible employees at the Company's corporate headquarters and manufacturing facilities to support succession planning and continue execution of the Company's sustainable profitable growth strategy. As a result, the Company recorded a $2.7 million restructuring reserve associated with the program. These charges primarily consist of severance and employee-related benefits. Metallus recorded reserves for such restructuring charges as other current liabilities on the Consolidated Balance Sheets. The reserve balance at September 30, 2025 is expected to be used in the next twelve months.

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The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

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-Topic 420
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