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Leases (Tables)
12 Months Ended
Dec. 31, 2012
Leases [Abstract]  
Future minimum lease payments for capital leases and noncancelable operating leases
The Company leases certain facilities, office space, vehicles, data processing and other equipment under capital and operating leases. Rental expenses for the years ended December 31, 2012, 2011 and 2010 were $85.6 million, $74.7 million and $67.5 million, respectively. Future minimum lease payments with respect to capital leases and operating leases with noncancelable terms in excess of one year were as follows:

   
Capital
  
Operating
 
(dollars in millions)
 
Lease Payments
  
Lease Payments
 
        
Year ending December 31:
      
2013
 $12.3  $65.0 
2014
  12.1   62.7 
2015
  10.0   50.2 
2016
  6.7   53.1 
2017
  4.2   38.0 
Thereafter
  75.8   117.8 
          
Future minimum lease payments
  121.1   386.8 
Less: amount representing interest
  (60.4)   
          
Lease obligations at December 31, 2012
 $60.7  $386.8