Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Definite-Lived Intangible Assets [Roll Forward]
Beginning Balance				$ 65.6
Amortization		$ (1.4)	$ (1.2)	(2.8)	$ (2.5)
Ending Balance		62.8		62.8
Accumulated Amortization		12.1		12.1		$ 9.3
Estimated Annual Amortization Expense for Definite-Lived Intangible Assets [Abstract]
Remainder of 2017		2.7		2.7
2018		5.1		5.1
2019		4.8		4.8
2020		4.5		4.5
2021		4.4		4.4
Thereafter		41.3		41.3
Intangible Assets [Abstract]
Total Intangible Assets		79.4		79.4		$ 82.2
Total Intangible Assets, Amortization		(1.4)	$ (1.2)	$ (2.8)	$ (2.5)
Weighted Average [Member]
Definite-Lived Intangible Assets [Roll Forward]
Remaining Useful Life (Years)				19 years
Trademarks and Trade Names [Member]
Indefinite-Lived Intangible Assets [Roll Forward]
Beginning Balance				$ 16.6
Ending Balance		16.6		16.6
Customer Relationships [Member]
Definite-Lived Intangible Assets [Roll Forward]
Beginning Balance				59.3
Amortization				(2.3)
Ending Balance		57.0		$ 57.0
Remaining Useful Life (Years)				21 years
Intangible Assets [Abstract]
Total Intangible Assets, Amortization				$ (2.3)
Developed Technology and Other [Member]
Definite-Lived Intangible Assets [Roll Forward]
Beginning Balance	[1]			6.3
Amortization	[1]			(0.5)
Ending Balance	[1]	$ 5.8		5.8
Intangible Assets [Abstract]
Total Intangible Assets, Amortization	[1]			$ (0.5)
Developed Technology and Other [Member] | Minimum [Member]
Definite-Lived Intangible Assets [Roll Forward]
Remaining Useful Life (Years)				2 years
Developed Technology and Other [Member] | Maximum [Member]
Definite-Lived Intangible Assets [Roll Forward]
Remaining Useful Life (Years)				12 years
Developed Technology and Other [Member] | Weighted Average [Member]
Definite-Lived Intangible Assets [Roll Forward]
Remaining Useful Life (Years)				8 years

[1] Developed Technology and Other includes patents, non-compete agreements and land easements.