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Fair Value Measurement (Details 3) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Assets:      
Other current assets $ 351.7 $ 253.6 $ 322.9
Other long-term assets 813.7 825.0 844.1
Liabilities:      
Other current liabilities 1,371.1 1,600.6 1,643.1
Other long-term liabilities 786.1 821.9 763.6
Contingent consideration   20.0  
Recurring Basis
     
Assets:      
Settlement assets 78.4 179.9 286.7
Other long-term assets     76.8
Total assets at fair value 152.3 281.3 363.5
Liabilities:      
Contingent consideration 20.0 20.0  
Total liabilities at fair value 168.5 192.1 196.4
Recurring Basis | Interest rate swap contracts
     
Assets:      
Other current assets 6.7 1.0  
Other long-term assets 55.5 89.8 65.4
Liabilities:      
Other current liabilities 0.5 0.3 156.7
Other long-term liabilities 116.4 137.4  
Recurring Basis | Foreign currency derivative contracts
     
Assets:      
Other current assets   10.1  
Other long-term assets 11.1   10.9
Liabilities:      
Other current liabilities 21.1    
Other long-term liabilities 10.5 34.4 27.8
Recurring Basis | Forward-starting interest rate contracts
     
Liabilities:      
Other long-term liabilities     11.9
Recurring Basis | Student loan auction rate securities
     
Assets:      
Settlement assets 13.6 38.8 170.5
Recurring Basis | Corporate bonds
     
Assets:      
Settlement assets 6.1 6.6 10.2
Recurring Basis | State and municipal obligations
     
Assets:      
Settlement assets 56.7 133.9 95.5
Recurring Basis | Preferred stock
     
Assets:      
Settlement assets 2.0 0.6 0.5
Recurring Basis | Available-for-sale securities
     
Assets:      
Other long-term assets 0.6 0.5 0.5
Recurring Basis | U.S. Government guaranteed agency securities
     
Assets:      
Settlement assets     10.0
Recurring Basis | Quoted prices in active markets for identical assets (Level 1)
     
Assets:      
Settlement assets 2.0 0.6 0.5
Total assets at fair value 2.0 0.6 0.5
Recurring Basis | Quoted prices in active markets for identical assets (Level 1) | Preferred stock
     
Assets:      
Settlement assets 2.0 0.6 0.5
Recurring Basis | Significant other observable inputs (Level 2)
     
Assets:      
Settlement assets 62.8 140.5 115.7
Other long-term assets     76.8
Total assets at fair value 136.7 241.9 192.5
Liabilities:      
Total liabilities at fair value 148.5 172.1 196.4
Recurring Basis | Significant other observable inputs (Level 2) | Interest rate swap contracts
     
Assets:      
Other current assets 6.7 1.0  
Other long-term assets 55.5 89.8 65.4
Liabilities:      
Other current liabilities 0.5 0.3 156.7
Other long-term liabilities 116.4 137.4  
Recurring Basis | Significant other observable inputs (Level 2) | Foreign currency derivative contracts
     
Assets:      
Other current assets   10.1  
Other long-term assets 11.1   10.9
Liabilities:      
Other current liabilities 21.1    
Other long-term liabilities 10.5 34.4 27.8
Recurring Basis | Significant other observable inputs (Level 2) | Forward-starting interest rate contracts
     
Liabilities:      
Other long-term liabilities     11.9
Recurring Basis | Significant other observable inputs (Level 2) | Corporate bonds
     
Assets:      
Settlement assets 6.1 6.6 10.2
Recurring Basis | Significant other observable inputs (Level 2) | State and municipal obligations
     
Assets:      
Settlement assets 56.7 133.9 95.5
Recurring Basis | Significant other observable inputs (Level 2) | Available-for-sale securities
     
Assets:      
Other long-term assets 0.6 0.5 0.5
Recurring Basis | Significant other observable inputs (Level 2) | U.S. Government guaranteed agency securities
     
Assets:      
Settlement assets     10.0
Recurring Basis | Significant unobservable inputs (Level 3)
     
Assets:      
Settlement assets 13.6 38.8 170.5
Total assets at fair value 13.6 38.8 170.5
Liabilities:      
Contingent consideration 20.0 20.0  
Total liabilities at fair value 20.0 20.0  
Recurring Basis | Significant unobservable inputs (Level 3) | Student loan auction rate securities
     
Assets:      
Settlement assets $ 13.6 $ 38.8 $ 170.5