Goodwill and Intangible Assets - Intangible Assets Subject to Amortization (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,570.8	$ 3,295.0
Accumulated Amortization	(767.3)	(438.7)
Net Book Value	2,803.5	2,856.3
Customer lists
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,298.6	1,245.9
Accumulated Amortization	(240.6)	(174.5)
Net Book Value	1,058.0	1,071.4
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,236.9	2,022.1
Accumulated Amortization	(512.4)	(254.9)
Net Book Value	1,724.5	1,767.2
Tradenames
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	29.6	25.1
Accumulated Amortization	(12.5)	(8.2)
Net Book Value	17.1	16.9
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5.7	1.9
Accumulated Amortization	(1.8)	(1.1)
Net Book Value	$ 3.9	$ 0.8