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Intangible Assets, net (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
2011 acquisitions
Dec. 31, 2011
Covenants not to compete
Dec. 31, 2010
Covenants not to compete
Dec. 31, 2011
Loan fees
Dec. 31, 2010
Loan fees
Jul. 26, 2011
Loan fees
Unsecured revolving credit facility
Dec. 31, 2011
Customer lists/relationships
Dec. 31, 2010
Customer lists/relationships
Dec. 31, 2011
Software - internal use
Dec. 31, 2010
Software - internal use
Dec. 31, 2011
Other
Dec. 31, 2010
Other
Dec. 31, 2011
Trade names
Dec. 31, 2010
Trade names
Intangible assets subject to amortization:                                  
Intangible assets subject to amortization, Gross Carrying Amount $ 530.9 $ 423.3     $ 7.3 $ 7.1 $ 31.2 $ 23.9 $ 7.3 $ 477.7 $ 379.3 $ 8.1 $ 8.1 $ 6.6 $ 4.9    
Intangible assets subject to amortization, Accumulated Amortization (145.6) (110.0)     (6.9) (6.7) (17.6) (14.1)   (114.2) (83.7) (4.7) (3.8) (2.2) (1.7)    
Intangible assets not subject to amortization:                                  
Intangible assets not subject to amortization, Gross Carrying Amount                               510.6 442.5
Intangible assets                                  
Intangible assets, Gross Carrying Amount 1,041.5 865.8                              
Intangible assets acquired, excluding goodwill       174.3                          
Changes in intangible assets due to foreign currency translation losses 5.9                                
Amortization expense for intangible assets 35.8 29.6 29.8                            
Summary of estimated aggregate amortization expense for each of the next five years                                  
2012 40.4                                
2013 40.4                                
2014 38.4                                
2015 36.8                                
2016 $ 35.1