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Derivative Financial Instruments (Details) BRL in Millions, AUD in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 BRL item	Jun. 30, 2015 AUD item	Jun. 30, 2015 USD ($) item	Sep. 30, 2014 BRL item	Sep. 30, 2014 USD ($) item
Derivative financial instruments
Effective portion of derivatives expected to be reclassified from accumulated other comprehensive loss to cost of revenue, net			$ 0.8
Cash Flow Hedging | Interest rate swap agreements
Derivative financial instruments
Effective portion of derivatives before tax effect			7.5
Effective portion of derivatives expected to be reclassified from accumulated other comprehensive loss to cost of revenue, net			6.5
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swap agreements
Derivative financial instruments
Effective portion of derivatives before tax effect	$ 1.7	$ (2.9)	(8.2)	$ (3.2)
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap September 2018
Derivative financial instruments
Notional Amount							$ 300.0
Fixed Rate (as a percent)					1.54%	1.54%	1.54%
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap June 2018
Derivative financial instruments
Notional Amount							$ 300.0		$ 300.0
Fixed Rate (as a percent)					1.63%	1.63%	1.63%	1.63%	1.63%
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap September 2015
Derivative financial instruments
Notional Amount							$ 250.0		$ 250.0
Fixed Rate (as a percent)					0.95%	0.95%	0.95%	0.95%	0.95%
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap December 2014
Derivative financial instruments
Notional Amount									$ 200.0
Fixed Rate (as a percent)								0.68%	0.68%
Designated as Hedging Instrument | Cash Flow Hedging | Foreign Exchange Option
Derivative financial instruments
Effective portion of derivatives before tax effect			1.5
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency forward contracts
Derivative financial instruments
Effective portion of derivatives before tax effect	$ (1.0)		$ (2.4)
Notional principal of derivative exchange contracts						AUD 102.6	$ 77.9
Not Designated as Hedging Instrument | Foreign currency forward contracts | United States of America, Dollars | Purchase
Derivative financial instruments
Notional Amount							95.6		$ 69.5
Not Designated as Hedging Instrument | Foreign currency forward contracts | United States of America, Dollars | Sell
Derivative financial instruments
Notional Amount							$ 69.0		71.5
Not Designated as Hedging Instrument | Foreign currency forward contracts | Brazil, Brazil Real | Purchase
Derivative financial instruments
Notional Amount								BRL 1.1	$ 0.4
Options outstanding | item					0	0	0
Not Designated as Hedging Instrument | Foreign currency forward contracts | Brazil, Brazil Real | Sell
Derivative financial instruments
Notional Amount					BRL 4.0		$ 1.3
Options outstanding | item								0	0
Not Designated as Hedging Instrument | Options Held
Derivative financial instruments
Notional principal of derivative exchange contracts							$ 0.0

X

- Definition

Aggregate notional amount of foreign currency derivatives to exchange foreign currencies. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

+ References

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Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Article 12



-Section 13



-Sentence Column B

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Fixed interest rate related to the interest rate derivative.

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 815



-SubTopic 10



-Section 50



-Paragraph 4C



-Subparagraph (b)



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The number of derivative instruments of a particular group held by the entity.

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-Topic 815



-SubTopic 10



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