v3.25.2
Schedule of Derivatives (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2026
Derivative Instruments, Gain (Loss) [Line Items]          
Cost of goods sold $ 1,335.5 $ 1,415.0 $ 2,572.9 $ 2,823.4  
Other income (expense), net 3.6 (8.8) 0.7 (8.8)  
Interest expense (43.1) (47.9) (86.0) (96.9)  
Gain on Business Combination Derivative $ 46.3 $ 0.0 $ 68.2 $ 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 Other income (expense), net Other income (expense), net  
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 2.8 $ (2.8) $ 3.7 $ (1.7)  
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 Gain on Business Combination Derivative  
Gain on Business Combination Derivative $ 46.3 $ 0.0 $ 68.2 $ 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 $ (1.9) $ 5.7 $ (6.0) $ 10.4  
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         $ 3.7
Currency Swap [Member] | Fair Value Hedging | Designated as Hedging Instrument [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative, Gain (Loss) on Derivative, Net $ (17.0) $ 2.0 $ (25.0) $ 7.0  
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 $ 0.4 $ 1.1 $ 1.4 $ 1.4  
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         $ 0.1