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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		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives - Foreign Currency contracts	$ (3.3)		$ (3.3)		$ 12.0
(Loss)/Gain Recognized in OCI	(5.4)	$ 7.8	(8.0)	$ 11.5
Loss Reclassified From OCI into Income(Effective Portion)	2.1	(1.0)	7.1	(6.1)
Foreign currency contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives - Foreign Currency contracts	1.3		1.3		4.3
(Loss)/Gain Recognized in OCI	(0.4)	5.6	3.7	4.8
Loss Reclassified From OCI into Income(Effective Portion)	1.9	(0.8)	6.7	(5.1)
Interest rate swaps (2017 and 2018)
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives - Foreign Currency contracts	(3.9)		(3.9)		$ 7.7
(Loss)/Gain Recognized in OCI	(4.1)	2.2	(11.0)	6.7
Loss Reclassified From OCI into Income(Effective Portion)	0.2	$ (0.2)	0.4	$ (1.0)
Zinc contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives - Foreign Currency contracts	(0.7)		(0.7)
(Loss)/Gain Recognized in OCI	(0.9)		(0.7)
Loss Reclassified From OCI into Income(Effective Portion)	$ 0.0		$ 0.0

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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 of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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