Goodwill and Intangible Assets - Intangible Assets Subject to Amortization (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,316.5	$ 1,352.8
Accumulated Amortization	(441.7)	(344.6)
Net Book Value	874.8	1,008.2
Customer Lists
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	927.8	952.0
Accumulated Amortization	(283.2)	(222.5)
Net Book Value	644.6	729.5
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	381.3	393.0
Accumulated Amortization	(155.6)	(119.9)
Net Book Value	225.7	273.1
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5.9	6.1
Accumulated Amortization	(1.6)	(1.1)
Net Book Value	4.3	5.0
Non-compete agreement
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1.5	1.7
Accumulated Amortization	(1.3)	(1.1)
Net Book Value	$ 0.2	$ 0.6