Goodwill and Intangible Assets - Intangible Assets Subject to Amortization (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 1,359.5	$ 1,316.5
Accumulated Amortization	(497.0)	(441.7)
Net Book Value	862.5	874.8
Customer lists
Finite-Lived Intangible Assets
Gross Carrying Amount	925.7	927.8
Accumulated Amortization	(317.3)	(283.2)
Net Book Value	608.4	644.6
Developed technology
Finite-Lived Intangible Assets
Gross Carrying Amount	381.5	381.3
Accumulated Amortization	(175.1)	(155.6)
Net Book Value	206.4	225.7
Tradenames
Finite-Lived Intangible Assets
Gross Carrying Amount	50.8	5.9
Accumulated Amortization	(3.2)	(1.6)
Net Book Value	47.6	4.3
Non-compete agreements
Finite-Lived Intangible Assets
Gross Carrying Amount	1.5	1.5
Accumulated Amortization	(1.4)	(1.3)
Net Book Value	$ 0.1	$ 0.2

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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