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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]    
Weighted Average Remaining Useful Life (in Years) 11 years 6 months 11 years 8 months 12 days
Gross Carrying Amount $ 535.0 $ 535.0
Accumulated Amortization $ 135.4 $ 125.0
Customer Relationships    
Finite Lived Intangible Assets [Line Items]    
Weighted Average Remaining Useful Life (in Years) 11 years 7 months 6 days 11 years 9 months 18 days
Gross Carrying Amount $ 497.8 $ 497.8
Accumulated Amortization $ 118.6 $ 109.8
Trademarks and Trade Names    
Finite Lived Intangible Assets [Line Items]    
Weighted Average Remaining Useful Life (in Years) 10 years 9 years 9 months 18 days
Gross Carrying Amount $ 32.9 $ 32.9
Accumulated Amortization $ 14.6 $ 13.2
Other Intangible Assets    
Finite Lived Intangible Assets [Line Items]    
Weighted Average Remaining Useful Life (in Years) 3 years 4 months 24 days 3 years 7 months 6 days
Gross Carrying Amount $ 4.3 $ 4.3
Accumulated Amortization $ 2.2 $ 2.0