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Other Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]      
Future amortization expense 2018 $ 23.3    
Future amortization expense 2019 22.1    
Future amortization expense 2020 20.4    
Future amortization expense 2021 19.3    
Future amortization expense 2022 16.4    
Finite-Lived Intangible Assets [Line Items]      
Amortization expense of intangible assets 21.2 $ 21.9 $ 26.1
Acquired finite-lived intangible assets related to acquisitions 7.0 29.0  
Gross Amount 350.5 332.2  
Accumulated Amortization (209.8) (184.1)  
Net Amount 140.7 148.1  
Customer lists      
Finite-Lived Intangible Assets [Line Items]      
Gross Amount 267.3 252.4  
Accumulated Amortization (172.2) (151.4)  
Net Amount 95.1 101.0  
Trade names      
Finite-Lived Intangible Assets [Line Items]      
Gross Amount 68.8 65.5  
Accumulated Amortization (33.8) (28.9)  
Net Amount 35.0 36.6  
Other intangible assets      
Finite-Lived Intangible Assets [Line Items]      
Gross Amount 14.4 14.3  
Accumulated Amortization (3.8) (3.8)  
Net Amount $ 10.6 $ 10.5  
Minimum      
Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible assets, useful life 7 years    
Maximum      
Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible assets, useful life 15 years