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Schedule of Derivatives (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2026
Derivative Instruments, Gain (Loss) [Line Items]      
Cost of goods sold $ 1,237.4 $ 1,408.4  
Other income (expense), net (2.9) 0.0  
Interest expense (42.9) (49.0)  
Gain on Business Combination Derivative $ 21.9 $ 0.0  
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other income (expense), net Other income (expense), net  
Derivative Instruments Not Designated as Hedging Instruments, Gain $ 0.9 $ 1.1  
Foreign Exchange Forward [Member] | Dowlais Group plc | Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Gain on Business Combination Derivative Gain on Business Combination Derivative  
Gain on Business Combination Derivative $ 21.9 $ 0.0  
Foreign Exchange Forward [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net $ (4.1) $ 4.7  
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of goods sold Cost of goods sold  
Foreign Exchange Forward [Member] | Cost of Sales [Member] | Cash Flow Hedging [Member] | Forecast [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Cash flow hedge gain (loss) to be reclassified within twelve months     $ (7.4)
Currency Swap [Member] | Fair Value Hedging | Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net $ (8.0) $ 5.0  
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other income (expense), net Other income (expense), net  
Currency Swap [Member] | Nonoperating Income (Expense) [Member] | Fair Value Hedging | Forecast [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Cash flow hedge gain (loss) to be reclassified within twelve months     0.0
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Gain (Loss) on Derivative, Net $ 1.0 $ 0.3  
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest expense Interest expense  
Interest Rate Swap [Member] | Interest Expense [Member] | Cash Flow Hedging [Member] | Forecast [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Cash flow hedge gain (loss) to be reclassified within twelve months     $ 1.7