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Goodwill and Other Intangible Assets - Summary of Intangible Assets (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, accumulated amortization $ (609.4) $ (478.4)
Gross Value 1,775.9 1,784.4
Accumulated Amortization (609.4) (478.4)
Net Value 1,166.5 1,306.0
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 1,203.0 1,211.5
Finite-lived intangible assets, accumulated amortization (596.3) (468.0)
Finite-lived intangible assets, net value 606.7 743.5
Accumulated Amortization (596.3) (468.0)
Other intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, gross 26.9 26.9
Finite-lived intangible assets, accumulated amortization (13.1) (10.4)
Finite-lived intangible assets, net value 13.8 16.5
Accumulated Amortization $ (13.1) $ (10.4)
Minimum | Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Useful Life (in years) 1 year 1 year
Minimum | Other intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Useful Life (in years) 2 years 2 years
Maximum | Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Useful Life (in years) 15 years 15 years
Maximum | Other intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Useful Life (in years) 13 years 13 years
C&W trade name    
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets $ 546.0 $ 546.0