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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]      
Weighted Average Remaining Useful Life (in Years) 13 years 6 months   13 years 6 months 40 days
Gross Carrying Amount $ 333.5   $ 333.5
Accumulated Amortization 68.4   $ 62.7
Intangible assets amortization expense $ 5.7 $ 5.7  
Customer Relationships      
Finite-Lived Intangible Assets [Line Items]      
Weighted Average Remaining Useful Life (in Years) 13 years 1 month   13 years 4 months
Gross Carrying Amount $ 311.5   $ 311.5
Accumulated Amortization $ 62.4   $ 57.3
Trademarks and Trade Names      
Finite-Lived Intangible Assets [Line Items]      
Weighted Average Remaining Useful Life (in Years) 13 years 6 months   13 years 6 months 33 days
Gross Carrying Amount $ 21.8   $ 21.8
Accumulated Amortization $ 5.8   $ 5.2
Other Intangible Assets      
Finite-Lived Intangible Assets [Line Items]      
Weighted Average Remaining Useful Life (in Years) 1 year   1 year 2 months 12 days
Gross Carrying Amount $ 0.2   $ 0.2
Accumulated Amortization $ 0.2   $ 0.2