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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)

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- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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