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Schedule of Derivatives (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2026
Derivative Instruments, Gain (Loss) [Line Items]          
Cost of goods sold $ 1,316.3 $ 1,333.6 $ 3,889.2 $ 4,157.0  
Other income (expense), net 1.6 (5.5) 2.3 (14.3)  
Interest expense (42.7) (45.2) (128.7) (142.1)  
Gain (loss) on Business Combination Derivative (16.0) 0.0 52.2 0.0  
Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Instruments Not Designated as Hedging Instruments, Gain 1.1   4.8    
Derivative Instruments Not Designated as Hedging Instruments, Loss   (1.9)   (3.6)  
Foreign Exchange Forward [Member] | Dowlais Group plc | Not Designated as Hedging Instrument [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Gain (loss) on Business Combination Derivative (16.0) 0.0 52.2 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 $ 1.6 $ 2.0 $ (4.4) $ 12.4  
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Cost of goods sold Cost of goods sold 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         $ 7.1
Currency Swap [Member] | Fair Value Hedging | Designated as Hedging Instrument [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Gain (Loss) on Derivative, Net $ 0.9 $ (7.4) $ (24.1) $ (0.4)  
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Other income (expense), net Other income (expense), net 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 $ 0.1 $ 1.2 $ 1.5 $ 2.6  
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Interest expense Interest expense 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         $ (0.3)