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Leases (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Leases [Abstract]      
Rental expenses $ 74.7 $ 67.5 $ 57.4
Future minimum lease payments with respect to capital leases [Abstract]      
2012 7.5    
2013 5.5    
2014 4.3    
2015 2.1    
2016 0.2    
Thereafter 0.2    
Future minimum lease payments 19.8    
Less: amount representing interest (1.2)    
Lease obligations at December 31, 2011 18.6    
Future minimum lease payments with respect to operating leases [Abstract]      
2012 56.2    
2013 49.7    
2014 48.8    
2015 37.3    
2016 42.6    
Thereafter 75.6    
Future minimum lease payments 310.2    
Less: amount representing interest 0    
Lease obligations at December 31, 2011 $ 310.2