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Leases (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Leases [Abstract]      
Rental expenses $ 85.6 $ 74.7 $ 67.5
Future minimum lease payments with respect to capital leases [Abstract]      
2013 12.3    
2014 12.1    
2015 10.0    
2016 6.7    
2017 4.2    
Thereafter 75.8    
Future minimum lease payments 121.1    
Less: amount representing interest (60.4)    
Lease obligations at December 31, 2012 60.7    
Future minimum lease payments with respect to operating leases [Abstract]      
2013 65.0    
2014 62.7    
2015 50.2    
2016 53.1    
2017 38.0    
Thereafter 117.8    
Future minimum lease payments 386.8    
Less: amount representing interest 0    
Lease obligations at December 31, 2012 $ 386.8