v3.23.1
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 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]          
Derivatives - Foreign Currency contracts $ 64.3   $ 64.3   $ 96.6
(Loss)/Gain Recognized in OCI (7.5) $ 36.2 (13.2) $ 43.4  
Loss Reclassified From OCI into Income(Effective Portion) 6.6 2.0 19.1 3.8  
Foreign currency contracts          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivatives - Foreign Currency contracts (0.7)   (0.7)   16.3
(Loss)/Gain Recognized in OCI (0.2) 0.9      
Loss Reclassified From OCI into Income(Effective Portion) 1.1 1.8      
Interest rate swap          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivatives - Foreign Currency contracts 68.5   68.5   86.4
(Loss)/Gain Recognized in OCI (6.7) 32.3 (6.7) 36.8  
Loss Reclassified From OCI into Income(Effective Portion) 6.3 (1.7) 11.2 (3.5)  
Zinc contracts          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivatives - Foreign Currency contracts (3.5)   (3.5)   $ (6.1)
(Loss)/Gain Recognized in OCI (0.6) 3.0 2.9 6.0  
Loss Reclassified From OCI into Income(Effective Portion) $ (0.8) $ 1.9 0.3 4.5  
Foreign currency contracts          
Derivative Instruments, Gain (Loss) [Line Items]          
(Loss)/Gain Recognized in OCI     (9.4) 0.6  
Loss Reclassified From OCI into Income(Effective Portion)     $ 7.6 $ 2.8