Goodwill and Intangible Assets (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2015	Dec. 31, 2014
Intangible Assets [Abstract]
Definite-Lived Intangible Assets		$ 66.7	$ 1.9
Definite-Lived Intangible Assets, Additions as a Result of Acquisitions		66.4
Definite-Lived Intangible Assets, Amortization		1.6
Total Intangible Assets		83.3	1.9
Total Intangible Assets, Additions as a Result of Acquisitions		83.0
Definite-Lived Intangible Assets, Fiscal Year Amortization Expense [Abstract]
Definite-Lived Intangible Assets, Estimated Amortization Expense, Remainder of 2015		2.6
Definite-Lived Intangible Assets, Estimated Amortization Expense, 2016		4.3
Definite-Lived Intangible Assets, Estimated Amortization Expense, 2017		4.2
Definite-Lived Intangible Assets, Estimated Amortization Expense, 2018		4.1
Definite-Lived Intangible Assets, Estimated Amortization Expense, 2019		4.0
Definite-Lived Intangible Assets, Estimated Amortization Expense, Thereafter		$ 47.5
Minimum [Member]
Intangible Assets [Abstract]
Definite-Lived Intangible Assets, Useful Life (Years)		1 year
Maximum [Member]
Intangible Assets [Abstract]
Definite-Lived Intangible Assets, Useful Life (Years)		23 years
Weighted Average [Member]
Intangible Assets [Abstract]
Definite-Lived Intangible Assets, Useful Life (Years)		21 years
Trademarks and Trade Names [Member]
Intangible Assets [Abstract]
Indefinite-Lived Intangible Assets		$ 16.6	0.0
Indefinite-Lived Intangible Assets, Additions as a Result of Acquisitions		16.6
Customer Relationships [Member]
Intangible Assets [Abstract]
Definite-Lived Intangible Assets		58.8	0.0
Definite-Lived Intangible Assets, Additions as a Result of Acquisitions		60.1
Definite-Lived Intangible Assets, Amortization		$ 1.3
Definite-Lived Intangible Assets, Useful Life (Years)		23 years
Developed Technology and Other [Member]
Intangible Assets [Abstract]
Definite-Lived Intangible Assets	[1]	$ 7.9	$ 1.9
Definite-Lived Intangible Assets, Additions as a Result of Acquisitions	[1]	6.3
Definite-Lived Intangible Assets, Amortization	[1]	$ 0.3
Developed Technology and Other [Member] | Minimum [Member]
Intangible Assets [Abstract]
Definite-Lived Intangible Assets, Useful Life (Years)		1 year
Developed Technology and Other [Member] | Maximum [Member]
Intangible Assets [Abstract]
Definite-Lived Intangible Assets, Useful Life (Years)		14 years
Developed Technology and Other [Member] | Weighted Average [Member]
Intangible Assets [Abstract]
Definite-Lived Intangible Assets, Useful Life (Years)		9 years
Investments and Other [Member]
Goodwill [Roll Forward]
Balance as of December 31, 2014		$ 2.9
Acquired Goodwill		127.2
Balance as of June 30, 2015		$ 130.1

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