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Derivative Financial Instruments (Details) In Millions, unless otherwise specified							9 Months Ended
	Jun. 30, 2014 Derivatives designated as hedging instruments Cash flow hedges Interest rate swap agreements expiring in June 2018 USD ($)	Jun. 30, 2014 Derivatives designated as hedging instruments Cash flow hedges Interest rate swap agreements expiring in September 2015 USD ($)	Sep. 30, 2013 Derivatives designated as hedging instruments Cash flow hedges Interest rate swap agreements expiring in September 2015 USD ($)	Jun. 30, 2014 Derivatives designated as hedging instruments Cash flow hedges Interest rate swap agreements expiring in December 2014 USD ($)	Sep. 30, 2013 Derivatives designated as hedging instruments Cash flow hedges Interest rate swap agreements expiring in December 2014 USD ($)	Sep. 30, 2013 Derivatives designated as hedging instruments Cash flow hedges Interest rate swap agreements expiring in December 2013 USD ($)	Jun. 30, 2014 Derivatives designated as hedging instruments Cash flow hedges Foreign currency options USD ($)	Jun. 30, 2014 Derivatives designated as hedging instruments Cash flow hedges Foreign currency options BRL	Sep. 30, 2013 Derivatives designated as hedging instruments Cash flow hedges Foreign currency options USD ($)	Sep. 30, 2013 Derivatives designated as hedging instruments Cash flow hedges Foreign currency options BRL	Jun. 30, 2014 Derivatives not designated as hedging instruments Foreign currency forward contracts USD for foreign currencies Purchase USD ($)	Sep. 30, 2013 Derivatives not designated as hedging instruments Foreign currency forward contracts USD for foreign currencies Purchase USD ($)	Jun. 30, 2014 Derivatives not designated as hedging instruments Foreign currency forward contracts USD for foreign currencies Sell USD ($)	Sep. 30, 2013 Derivatives not designated as hedging instruments Foreign currency forward contracts USD for foreign currencies Sell USD ($)	Jun. 30, 2014 Derivatives not designated as hedging instruments Foreign currency forward contracts GBP for BRL Purchase item	Sep. 30, 2013 Derivatives not designated as hedging instruments Foreign currency forward contracts GBP for BRL Purchase USD ($)	Sep. 30, 2013 Derivatives not designated as hedging instruments Foreign currency forward contracts GBP for BRL Purchase BRL	Jun. 30, 2014 Derivatives not designated as hedging instruments Foreign currency forward contracts GBP for BRL Sell USD ($)	Jun. 30, 2014 Derivatives not designated as hedging instruments Foreign currency forward contracts GBP for BRL Sell BRL	Sep. 30, 2013 Derivatives not designated as hedging instruments Foreign currency forward contracts GBP for BRL Sell USD ($)	Sep. 30, 2013 Derivatives not designated as hedging instruments Foreign currency forward contracts GBP for BRL Sell BRL
Derivative financial instruments
Notional Amount	$ 300.0	$ 250.0	$ 250.0	$ 200.0	$ 200.0	$ 150.0					$ 93.8	$ 171.8	$ 59.9	$ 174.2		$ 1.8	4.0	$ 1.9	4.1	$ 3.6	8.2
Fixed Rate (as a percent)	1.63%	0.95%	0.95%	0.68%	0.68%	0.55%
Notional principal of derivative exchange contracts							$ 0.5	1.1	$ 0.9	2.1
Maximum maturity term							12 months	12 months
Number of contracts															0