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INCOME TAXES - Narrative (Details) $ / shares in Units, SFr in Millions, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($) $ / shares	Sep. 30, 2018	Sep. 30, 2019 CHF (SFr)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)
Income Tax Contingency [Line Items]
Effective income tax rate	(0.40%)		(20.60%)	(3.50%)	(3.50%)	(8.40%)
Tax expense, tax reform-related adjustments, due to clarification in IRS guidance	$ 1.6				$ 1.6
Tax benefit from Switzerland tax holiday		$ 10.8
Tax benefit from Switzerland tax holiday (in dollars per share) | $ / shares		$ 0.13
Tax benefit, related to share-based compensation						$ 1.2
Foreign Tax Authority | Swiss Federal Tax Administration (FTA)
Income Tax Contingency [Line Items]
Federal tax credit | SFr				SFr 12
Federal tax credit, term				7 years	7 years
Rebound
Income Tax Contingency [Line Items]
In-process research and development (IPR&D) expense	$ 59.9				$ 59.9

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