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Derivative Financial Instruments (Details 2) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2012
Interest rate swap agreements
Cash flow hedges
Dec. 31, 2012
Derivatives designated as hedging instruments
Foreign currency options
Cash flow hedges
Dec. 31, 2012
Derivatives designated as hedging instruments
Foreign currency options
Prepaid expenses and other current assets
Sep. 30, 2012
Derivatives designated as hedging instruments
Foreign currency options
Prepaid expenses and other current assets
Dec. 31, 2012
Derivatives designated as hedging instruments
Interest rate swap agreements
Cash flow hedges
Dec. 31, 2011
Derivatives designated as hedging instruments
Interest rate swap agreements
Cash flow hedges
Dec. 31, 2012
Derivatives designated as hedging instruments
Interest rate swap agreements
Accrued expenses and other current liabilities
Sep. 30, 2012
Derivatives designated as hedging instruments
Interest rate swap agreements
Accrued expenses and other current liabilities
Dec. 31, 2012
Derivatives designated as hedging instruments
Interest rate swap agreements
Other long-term liabilities
Sep. 30, 2012
Derivatives designated as hedging instruments
Interest rate swap agreements
Other long-term liabilities
Dec. 31, 2012
Derivatives not designated as hedging instruments
Dec. 31, 2011
Derivatives not designated as hedging instruments
Dec. 31, 2012
Derivatives not designated as hedging instruments
Option contracts
Cost of revenue
Sep. 30, 2012
Derivatives not designated as hedging instruments
Option contracts
Prepaid expenses and other current assets
Dec. 31, 2012
Derivatives not designated as hedging instruments
Foreign currency forward contracts
General and administrative expenses
Dec. 31, 2011
Derivatives not designated as hedging instruments
Foreign currency forward contracts
General and administrative expenses
Dec. 31, 2012
Derivatives not designated as hedging instruments
Foreign currency forward contracts
Prepaid expenses and other current assets
Sep. 30, 2012
Derivatives not designated as hedging instruments
Foreign currency forward contracts
Prepaid expenses and other current assets
Dec. 31, 2012
Derivatives not designated as hedging instruments
Foreign currency forward contracts
Accrued expenses and other current liabilities
Sep. 30, 2012
Derivatives not designated as hedging instruments
Foreign currency forward contracts
Accrued expenses and other current liabilities
Fair values of outstanding derivative instruments                                            
Derivative assets $ 0.3 $ 0.6     $ 0.1 $ 0.1                   $ 0.1     $ 0.2 $ 0.4    
Derivative liabilities 6.9 6.7             2.9 2.9 2.5 3.2                 1.5 0.6
Effect of derivative instruments on income and other comprehensive income                                            
Increase in Losses Recognized in Accumulated Other Comprehensive Loss on Derivatives Before Tax Effect (Effective Portion)     5.4         (0.8)                            
Losses Reclassified from Accumulated Other Comprehensive Loss into Income (Effective Portion)             (0.7) (0.4)                            
Losses Recognized in Income on Derivatives (Amount Excluded from Effectiveness Testing and Ineffective Portion)       (0.1)                                    
Non designated derivatives, Gains/(Losses) Recognized in Income on Derivatives (Amount Excluded from Effectiveness Testing and Ineffective Portion)                         $ (1.1) $ 1.5 $ (0.1)   $ (1.0) $ 1.5