DISPOSITIONS - Sale of NUCYNTA (Details) - NUCYNTA - Disposal Group, Disposed of by Sale, Not Discontinued Operations $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Feb. 11, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Feb. 13, 2020 USD ($) payment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration received, including base purchase price, inventory adjustment and royalties received				$ 367.9
Proceeds from divestiture of businesses, base purchase price				375.0
Proceeds from divestiture of businesses, inventory amount				$ 6.0
Royalties received	$ 13.1
Number of lump sum payments | payment				2
Gain (loss) on disposal			$ (15.8)
Consideration received			367.9
Carrying value of intangible derecognized		$ 369.1	369.1
Inventory transfer		5.6	5.6
Accrued third-party consent fees		9.0	$ 9.0
Net proceeds received		$ 1.0
Third-Party Consent Agreement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Lump sum payments obligation				$ 4.5