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Derivative Financial Instruments and Fair Value Measurement (Details)
AUD in Millions, $ in Millions
12 Months Ended
Sep. 30, 2015
USD ($)
item
Sep. 30, 2014
GBP (£)
item
Sep. 30, 2015
AUD
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Derivative financial instruments          
Number of contingent consideration arrangements | item 2 2      
Level 3          
Derivative financial instruments          
Fair value of contingent consideration liability       $ 39.0 $ 17.0
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swap agreements          
Derivative financial instruments          
Losses Recognized in Income on Derivatives (Amount Excluded from Effectiveness Testing and Ineffective Portion) $ 0.0        
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%
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%  
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap September 2015          
Derivative financial instruments          
Notional Amount         $ 250.0
Fixed Rate (as a percent)   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 Contracts          
Derivative financial instruments          
Notional principal of derivative exchange contracts   £ 0 AUD 98.1 $ 74.1