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Derivative Financial Instruments (Details)
In Millions, unless otherwise specified
 3 Months Ended 3 Months Ended
Dec. 31, 2012
Cash flow hedges
Interest rate swap agreements
USD ($)
Dec. 31, 2011
Derivatives designated as hedging instruments
Cash flow hedges
Interest rate swap agreements
USD ($)
Dec. 31, 2012
Derivatives designated as hedging instruments
Cash flow hedges
Interest rate swap agreements expiring in September 2015
USD ($)
Sep. 30, 2012
Derivatives designated as hedging instruments
Cash flow hedges
Interest rate swap agreements expiring in September 2015
USD ($)
Dec. 31, 2012
Derivatives designated as hedging instruments
Cash flow hedges
Interest rate swap agreements expiring in December 2014
USD ($)
Sep. 30, 2012
Derivatives designated as hedging instruments
Cash flow hedges
Interest rate swap agreements expiring in December 2014
USD ($)
Dec. 31, 2012
Derivatives designated as hedging instruments
Cash flow hedges
Interest rate swap agreements expiring in December 2013
USD ($)
Sep. 30, 2012
Derivatives designated as hedging instruments
Cash flow hedges
Interest rate swap agreements expiring in December 2013
USD ($)
Dec. 31, 2012
Derivatives designated as hedging instruments
Cash flow hedges
Foreign currency options
USD ($)
Dec. 31, 2012
Derivatives designated as hedging instruments
Cash flow hedges
Foreign currency options
BRL
Sep. 30, 2012
Derivatives designated as hedging instruments
Cash flow hedges
Foreign currency options
USD ($)
Sep. 30, 2012
Derivatives designated as hedging instruments
Cash flow hedges
Foreign currency options
BRL
Dec. 31, 2012
Derivatives not designated as hedging instruments
Foreign currency forward contracts
USD ($)
Dec. 31, 2012
Derivatives not designated as hedging instruments
Foreign currency forward contracts
BRL
Sep. 30, 2012
Derivatives not designated as hedging instruments
Foreign currency forward contracts
USD ($)
Sep. 30, 2012
Derivatives not designated as hedging instruments
Foreign currency forward contracts
BRL
Sep. 30, 2012
Derivatives not designated as hedging instruments
Option contracts
USD ($)
Derivative financial instruments                                  
Effective portion of derivatives before tax effect $ 5.4 $ (0.8)                              
Effective portion of derivatives expected to be reclassified from accumulated other comprehensive loss to interest expense 2.9                                
Notional Amount     250.0 250.0 200.0 200.0 150.0 150.0                  
Fixed Rate (as a percent)     0.95% 0.95% 0.68% 0.68% 0.55% 0.55%                  
Notional principal of derivative exchange contracts                 2.2 4.5 8.1 16.4 10.4 21.3 4.9 9.7  
Maximum maturity term                 24 months 24 months              
Notional principal of derivative contracts to purchase U.S. dollars with foreign currencies                         126.3   60.1    
Notional principal of derivative contracts to sell U.S. dollars for foreign currencies                         $ 58.2   $ 110.2   $ 17.3