v3.25.2
Senior Secured Credit Facilities Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 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 $ 0.3 3.3 $ 0.3    
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  
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     $ 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]            
Payment for Debt Extinguishment or Debt Prepayment Cost   2.2        
Debt Securities, Springing Maturity Threshold 250.0   250.0      
Repayments of Secured Debt     10.1      
Secured Debt [Member] | Refinancing Facility Agreement            
Debt Instrument [Line Items]            
Payments of Debt Issuance Costs   1.7        
Interest Paid, Including Capitalized Interest, Operating and Investing Activities   $ 0.5        
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