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Intangible Assets, net (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
item
Intangible assets subject to amortization:      
Intangible assets subject to amortization, Gross Carrying Amount $ 760.2 $ 752.2  
Intangible assets subject to amortization, Accumulated Amortization (405.7) (353.1)  
Intangible assets      
Intangible assets, Gross Carrying Amount 1,517.8 1,504.4  
Amortization expense for intangible assets 50.6 54.1 $ 53.7
Changes in intangible assets due to foreign currency translation gains 4.0    
Impairment losses of intangible assets, indefinite-lived   36.4 21.2
Impairment losses of intangible assets, finite-lived     $ 14.4
Summary of estimated aggregate amortization expense for each of the succeeding five years      
2018 46.7    
2019 46.6    
2020 46.6    
2021 42.6    
2022 34.3    
2017 Acquisitions      
Intangible assets      
Intangible assets recorded in connection with our 2017 acquisitions 7.4    
Trade names      
Intangible assets not subject to amortization:      
Intangible assets not subject to amortization, Gross Carrying Amount 757.6 $ 752.2  
Intangible assets      
Number of intangible assets subject to impairment | item   8 5
Impairment losses of intangible assets, indefinite-lived   $ 36.4 $ 21.2
Trade names | 2017 Acquisitions      
Intangible assets not subject to amortization:      
Intangible assets not subject to amortization, Gross Carrying Amount $ 3.7    
Covenants not to compete      
Intangible assets subject to amortization:      
Weighted average amortizable life in years 4 years 8 months 12 days    
Intangible assets subject to amortization, Gross Carrying Amount $ 0.8 1.1  
Intangible assets subject to amortization, Accumulated Amortization $ (0.4) (0.6)  
Customer lists/relationships      
Intangible assets subject to amortization:      
Weighted average amortizable life in years 14 years 7 months 6 days    
Intangible assets subject to amortization, Gross Carrying Amount $ 745.0 736.7  
Intangible assets subject to amortization, Accumulated Amortization $ (391.3) (338.9)  
Intangible assets      
Number of intangible assets subject to impairment | item     2
Impairment losses of intangible assets, finite-lived     $ 14.4
Software      
Intangible assets subject to amortization:      
Weighted average amortizable life in years 10 years    
Intangible assets subject to amortization, Gross Carrying Amount $ 8.1 8.1  
Intangible assets subject to amortization, Accumulated Amortization $ (8.1) (8.1)  
Other      
Intangible assets subject to amortization:      
Weighted average amortizable life in years 5 years 4 months 24 days    
Intangible assets subject to amortization, Gross Carrying Amount $ 6.3 6.3  
Intangible assets subject to amortization, Accumulated Amortization $ (5.9) $ (5.5)