Derivative Instruments and Fair Value Measurement (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Unrealized Gain (Loss) on Foreign Currency Derivatives, Net, before Tax [Abstract]
Pre-tax gains (losses) recorded in other comprehensive income related to forward exchange contracts (cash flow hedges)	$ 8.1	$ (6.8)	$ 7.4	$ (8.7)
Pre-tax gains (losses) recorded in other comprehensive income related to foreign currency denominated debt (net investment hedges)	0.6	(0.3)	0.5	(0.3)
Pre-tax gains (losses) recorded in other comprehensive income related to hedges, total	8.7	(7.1)	7.9	(9.0)
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Pre-tax gains (losses) reclassified from accumulated other comprehensive income into the Condensed Consolidated Statement of Operations related to forward exchange contracts designated as cash flow hedges	(0.1)	(0.2)	0.7	2.3
Sales [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Pre-tax gains (losses) reclassified from accumulated other comprehensive income into the Condensed Consolidated Statement of Operations related to forward exchange contracts designated as cash flow hedges	0.9	0	0.5	(0.2)
Cost of sales [Member]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]
Pre-tax gains (losses) reclassified from accumulated other comprehensive income into the Condensed Consolidated Statement of Operations related to forward exchange contracts designated as cash flow hedges	(1.0)	(0.2)	0.2	2.5
Other (expense) income [Member]
Derivative Instruments, Gain (Loss) Recognized in Income, Net [Abstract]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	$ (3.9)	$ (10.3)	$ (3.6)	$ (16.3)

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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.

+ References

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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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Before tax amount, net of reclassification adjustments, of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes 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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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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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