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Intangible Assets, net (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Intangible assets subject to amortization:      
Intangible assets subject to amortization, Gross Carrying Amount $ 555.3   $ 530.9
Intangible assets subject to amortization, Accumulated Amortization (166.4)   (145.6)
Intangible assets      
Intangible assets, Gross Carrying Amount 1,082.0   1,041.5
Changes in intangible assets due to foreign currency translation losses 0.4    
Amortization expense for intangible assets 20.9 15.8  
Summary of estimated aggregate amortization expense for each of the next five years      
2012 21.5    
2013 42.9    
2014 40.9    
2015 39.3    
2016 37.6    
2017 32.2    
2012 acquisitions
      
Intangible assets      
Intangible assets acquired, excluding goodwill 41.0    
Covenants not to compete
      
Intangible assets subject to amortization:      
Intangible assets subject to amortization, Gross Carrying Amount 7.6   7.3
Intangible assets subject to amortization, Accumulated Amortization (7.0)   (6.9)
Loan fees
      
Intangible assets subject to amortization:      
Intangible assets subject to amortization, Gross Carrying Amount 31.2   31.2
Intangible assets subject to amortization, Accumulated Amortization (18.9)   (17.6)
Customer lists/relationships
      
Intangible assets subject to amortization:      
Intangible assets subject to amortization, Gross Carrying Amount 501.8   477.7
Intangible assets subject to amortization, Accumulated Amortization (133.0)   (114.2)
Software - internal use
      
Intangible assets subject to amortization:      
Intangible assets subject to amortization, Gross Carrying Amount 8.1   8.1
Intangible assets subject to amortization, Accumulated Amortization (5.1)   (4.7)
Other
      
Intangible assets subject to amortization:      
Intangible assets subject to amortization, Gross Carrying Amount 6.6   6.6
Intangible assets subject to amortization, Accumulated Amortization (2.4)   (2.2)
Trade names
      
Intangible assets not subject to amortization:      
Intangible assets not subject to amortization, Gross Carrying Amount $ 526.7   $ 510.6