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BALANCE SHEET DETAILS AND OTHER FINANCIAL INFORMATION - Goodwill and Intangible Assets (Details) - USD ($) $ in Millions			9 Months Ended
	Aug. 17, 2018	May 25, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill			$ 236.1		$ 201.1
Deferred payments related to business combinations			$ 16.7	$ 0.0
Vattikuti Technologies Pvt. Ltd.
Business Acquisition [Line Items]
Cash payments		$ 38.1
Net tangible assets acquired		4.1
Intangible assets acquired		24.2
Goodwill		$ 9.8
Weighted average useful life		4 years 3 months 18 days
InTouch
Business Acquisition [Line Items]
Cash payments	$ 22.0
Net tangible assets acquired	13.3
Goodwill	$ 25.4
Weighted average useful life	5 years 8 months 12 days
Total purchase consideration	$ 38.7
Deferred payments related to business combinations	$ 16.7

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