Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)	12 years 10 months 30 days		13 years 6 months 40 days
Gross Carrying Amount	$ 333.5		$ 333.5
Accumulated Amortization	74.0		$ 62.7
Intangible assets amortization expense	$ 11.2	$ 11.4
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)	12 years 10 months 30 days		13 years 4 months
Gross Carrying Amount	$ 311.5		$ 311.5
Accumulated Amortization	$ 67.5		$ 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	$ 6.3		$ 5.2
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Useful Life (in Years)	7 months 30 days		1 year 2 months 12 days
Gross Carrying Amount	$ 0.2		$ 0.2
Accumulated Amortization	$ 0.2		$ 0.2