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Goodwill and Intangible Assets - Components of Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]    
Weighted Average Remaining Useful Life (in Years) 10 years 7 months 6 days 10 years 9 months 18 days
Gross Carrying Amount $ 543.7 $ 543.7
Accumulated Amortization $ 175.0 $ 165.5
Customer Relationships    
Finite Lived Intangible Assets [Line Items]    
Weighted Average Remaining Useful Life (in Years) 10 years 7 months 6 days 10 years 10 months 24 days
Gross Carrying Amount $ 504.6 $ 504.6
Accumulated Amortization $ 153.4 $ 144.5
Trademarks and Trade Names    
Finite Lived Intangible Assets [Line Items]    
Weighted Average Remaining Useful Life (in Years) 9 years 9 months 18 days 10 years 1 month 6 days
Gross Carrying Amount $ 34.8 $ 34.8
Accumulated Amortization $ 18.7 $ 18.3
Other Intangible Assets    
Finite Lived Intangible Assets [Line Items]    
Weighted Average Remaining Useful Life (in Years) 2 years 8 months 12 days 3 years
Gross Carrying Amount $ 4.3 $ 4.3
Accumulated Amortization $ 2.9 $ 2.7