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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Leases      
Total rent expense for operating leases $ 72.4 $ 81.3 $ 83.7
Future minimum aggregate rental commitments due      
Future minimum aggregate rental commitments under all noncancelable operating leases, net of sublease income 293.3    
2013 57.3    
2014 47.1    
2015 37.8    
2016 34.4    
2017 26.8    
Thereafter 89.9    
Letters of Credit
     
Letters of credit      
Outstanding letters of credit $ 45.1    
Options renewal period 1 year