Goodwill and Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Intangible Assets [Abstract]
Definite-Lived Intangible Assets	$ 67.7		$ 1.9
Definite-Lived Intangible Assets, Additions as a Result of Acquisitions	66.4
Definite-Lived Intangible Assets, Amortization	0.6
Total Intangible Assets	84.3		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, Amortization Expense, Remainder of 2015	3.6
Definite-Lived Intangible Assets, Amortization Expense, 2016	4.3
Definite-Lived Intangible Assets, Amortization Expense, 2017	4.2
Definite-Lived Intangible Assets, Amortization Expense, 2018	4.1
Definite-Lived Intangible Assets, Amortization Expense, 2019	4.0
Definite-Lived Intangible Assets, Amortization Expense, 2020 and Thereafter	47.5
Minimum [Member]
Intangible Assets [Abstract]
Definite-Lived Intangible Asset, Useful Life	1 year
Maximum [Member]
Intangible Assets [Abstract]
Definite-Lived Intangible Asset, Useful Life	23 years
Weighted Average [Member]
Intangible Assets [Abstract]
Definite-Lived Intangible Asset, Useful Life	21 years
Trademarks and Trade Names [Member]
Intangible Assets [Abstract]
Indefinite-Lived Intangible Assets	16.6		0
Indefinite-lived Intangible Assets, Additions as a Result of Acquisitions	16.6
Customer Relationships [Member]
Intangible Assets [Abstract]
Definite-Lived Intangible Assets	59.6		0
Definite-Lived Intangible Assets, Additions as a Result of Acquisitions	60.1
Definite-Lived Intangible Assets, Amortization	0.5
Definite-Lived Intangible Asset, Useful Life	23 years
Developed Technology and Other [Member]
Intangible Assets [Abstract]
Definite-Lived Intangible Assets	8.1	[1]	1.9	[1]
Definite-Lived Intangible Assets, Additions as a Result of Acquisitions	6.3	[1]
Definite-Lived Intangible Assets, Amortization	0.1	[1]
Developed Technology and Other [Member] | Minimum [Member]
Intangible Assets [Abstract]
Definite-Lived Intangible Asset, Useful Life	1 year
Developed Technology and Other [Member] | Maximum [Member]
Intangible Assets [Abstract]
Definite-Lived Intangible Asset, Useful Life	14 years
Developed Technology and Other [Member] | Weighted Average [Member]
Intangible Assets [Abstract]
Definite-Lived Intangible Asset, Useful Life	9 years
Investments and Other [Member]
Goodwill [Roll Forward]
Balance as of December 31, 2014	2.9
Acquired Goodwill	127.1
Balance as of March 31, 2015	$ 130.0

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