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Senior Secured Credit Facilities Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Payments of Debt Issuance Costs			$ 11.6	$ 1.7
Debt refinancing and redemption costs	$ 0.0	$ 0.2	3.3	$ 0.5
Second Amendment
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	925.0		925.0
Second Amendment \| Dowlais Group plc \| Forecast [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity					$ 1,495.0
Tranche C Term Facility \| Dowlais Group plc
Debt Instrument [Line Items]
Secured Debt						$ 843.0
Tranche C Term Facility \| Dowlais Group plc \| Forecast [Member]
Debt Instrument [Line Items]
Secured Debt					$ 835.0
Term Loan B [Member]
Debt Instrument [Line Items]
Secured Debt	648.0		648.0				$ 648.0
Secured Debt [Member] \| Second Amendment
Debt Instrument [Line Items]
Payments of Debt Issuance Costs			11.6
Debt refinancing and redemption costs			3.3
Secured Debt [Member] \| Term Loan B [Member]
Debt Instrument [Line Items]
Repayments of Secured Debt			8.4
Multi Currency Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity	897.1		897.1
Letters of Credit Outstanding, Amount	$ 27.9		$ 27.9