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Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Derivative instruments maturity period (in months) 36 months    
Minimum Percent Likely To Be Recognized To Measure Tax Benefit 50.00%    
Allowance for doubtful accounts receivable $ 5.9 $ 9.3  
Capitalized Computer Software, Period Increase (Decrease) $ 6.8 $ 3.8 $ 5.6
Internal Use Software, Policy [Policy Text Block]
Internal Use Software  —  The Company capitalizes certain expenditures for software that is purchased or internally developed for use in the business. During 2012, 2011, and 2010, internally developed software amounts capitalized were $6.8, $3.8 and $5.6, respectively. Amortization of internal use software begins when the software is ready for service and continues on the straight-line method generally over a life of three years.
 
   
Minimum [Member]
     
Finite-Lived Intangible Asset, Useful Life 4 years    
Number Of Days Receivables Are Generally Due 30 days    
Term Of Government Grant 1 year    
Maximum [Member]
     
Finite-Lived Intangible Asset, Useful Life 12 years    
Number Of Days Receivables Are Generally Due 60 days    
Term Of Government Grant 15 years    
Customer Management [Member]
     
Percent Of Revenue Derived From Agents 90.00%    
Building [Member]
     
Property, Plant and Equipment, Estimated Useful Lives 30    
Software [Member] | Minimum [Member]
     
Property, Plant and Equipment, Estimated Useful Lives three    
Software [Member] | Maximum [Member]
     
Property, Plant and Equipment, Estimated Useful Lives eight    
Equipment [Member] | Minimum [Member]
     
Property, Plant and Equipment, Estimated Useful Lives three    
Equipment [Member] | Maximum [Member]
     
Property, Plant and Equipment, Estimated Useful Lives five    
Software and Software Development Costs [Member]
     
Property, Plant and Equipment, Estimated Useful Lives five    
Computer Software, Intangible Asset [Member]
     
Amortization of Intangible Assets 3 years