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Financial Instruments and Risk Management - Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) (Details) - Designated as Hedging Instrument - Cash Flow Hedging - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Sep. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]      
Derivatives - Foreign Currency contracts $ 53.9   $ 39.2
(Loss)/Gain Recognized in OCI 20.4 $ (20.5)  
Loss Reclassified From OCI into Income(Effective Portion) 5.7 5.7  
Foreign currency contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivatives - Foreign Currency contracts 7.7   (4.6)
(Loss)/Gain Recognized in OCI 12.4 (6.1)  
Loss Reclassified From OCI into Income(Effective Portion) 0.1 0.9  
Interest rate swap      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivatives - Foreign Currency contracts 44.8   39.8
(Loss)/Gain Recognized in OCI 11.7 (12.6)  
Loss Reclassified From OCI into Income(Effective Portion) 6.7 8.0  
Zinc contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Derivatives - Foreign Currency contracts 1.4   $ 4.0
(Loss)/Gain Recognized in OCI (3.7) (1.8)  
Loss Reclassified From OCI into Income(Effective Portion) $ (1.1) $ (3.2)