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Senior Secured Credit Facilities Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 925.0
Payments of Debt Issuance Costs	11.6	$ 0.0
Debt refinancing and redemption costs	3.3	$ 0.0
Dowlais Group plc \| Forecast [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 1,495.0
Incremental Term Loan B \| Dowlais Group plc \| Forecast [Member]
Debt Instrument [Line Items]
Secured Debt			843.0
First Lien Bridge Credit Agreement \| Dowlais Group plc \| Forecast [Member]
Debt Instrument [Line Items]
Secured Debt			843.0
Second Lien Bridge Credit Agreement \| Dowlais Group plc \| Forecast [Member]
Debt Instrument [Line Items]
Secured Debt			$ 500.0
Term Loan B [Member]
Debt Instrument [Line Items]
Secured Debt	648.0			$ 648.0
Multi Currency Credit Facility Member
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	897.1
Letters of Credit Outstanding, Amount	27.9
Secured Debt [Member] \| Term Loan B [Member]
Debt Instrument [Line Items]
Repayments of Secured Debt	$ 11.8