Derivative Instruments and Fair Value Measurement (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Amount recognized in earnings as a result of ineffective hedges is not significant	not significant
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Net [Abstract]
Pre-tax amount of gains (losses) recorded in other comprehensive income (loss) related to forward exchange contracts (cash flow hedges)	$ 16.9	$ 1.8	$ (1.7)
Pre-tax amount of gains (losses) recorded in other comprehensive income (loss) related to foreign currency denominated debt (net investment hedges)	(0.3)	0.2	(0.5)
Total pre-tax amount of gains (losses) recorded in other comprehensive income (loss) related to hedges	16.6	2.0	(2.2)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI/OCL into Income, Effective Portion, Net [Abstract]
Pre-tax amount of gains (losses) reclassified from accumulated other comprehensive income into the Condensed Consolidated Statement of Operations related to derivative forward exchange contracts designated as cash flow hedges	(1.6)	6.5	6.4
Sales [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI/OCL into Income, Effective Portion, Net [Abstract]
Pre-tax amount of gains (losses) reclassified from accumulated other comprehensive income into the Condensed Consolidated Statement of Operations related to derivative forward exchange contracts designated as cash flow hedges	(2.3)	1.6	(1.1)
Cost of sales [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI/OCL into Income, Effective Portion, Net [Abstract]
Pre-tax amount of gains (losses) reclassified from accumulated other comprehensive income into the Condensed Consolidated Statement of Operations related to derivative forward exchange contracts designated as cash flow hedges	0.7	4.9	7.5
Other income (expense) [Member]
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Pre-tax amount of gains (losses) from forward exchange contracts not designated as hedging instruments recognized in the Consolidated Statement of Operations	$ 1.4	$ 0.1	$ (21.9)

A disclosure of an assertion that the amount of cash flow hedge ineffectiveness is immaterial.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

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The amount of net gains or losses on foreign currency cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

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Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated 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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Current period adjustment in other comprehensive income reflecting gains or losses on foreign currency transactions that are designated as, and are effective as, hedges of a net investment in a foreign entity, net of tax effect.

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Amount of net unrealized gain (loss) related to the change in fair value of foreign currency exchange rate derivatives designated as cash flow hedging instruments. Recorded in accumulated other comprehensive income to the extent that the cash flow hedge is determined to be effective.

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