FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS - Equity Investment in Entasis (Details) - Entasis $ / shares in Units, $ in Millions		3 Months Ended			12 Months Ended
	May 03, 2021 USD ($) shares	Jun. 30, 2021 Tranche $ / shares	Sep. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2020 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) Director	Dec. 31, 2020 USD ($)
Equity Investment
Number of tranches | Tranche		2
Number of investee's board members which may be designated by the Company | Director					2
Number of the Company's Board Members Currently Serving on the Board of Investee | Director					0
Number of the Investee's Board members | Director					6
Equity investment ownership percentage					59.90%	51.00%
Exercise price of warrants | $ / shares		$ 2.00
Unrealized gain from fair value changes in equity investments					$ 5.7	$ 30.5
Common stock and warrants
Equity Investment
Amount of securities purchase agreement			$ 12.5	$ 35.0
Equity and long-term investments at fair value					103.7	78.0
Common stock
Equity Investment
Number of shares to be purchased under the securities purchase agreement | shares	10,000,000		4,672,897	14,000,000
Amount of securities purchase agreement	$ 20.0
Equity and long-term investments at fair value					62.8	$ 46.1
Warrants
Equity Investment
Number of shares to be purchased under the securities purchase agreement | shares	10,000,000
Maximum number of additional shares into which warrants may be converted under the securities purchase agreement | shares				14,000,000
Exercise price of warrants | $ / shares			$ 2.675	$ 2.50
Term of warrants						5 years
Equity and long-term investments at fair value					$ 40.9	$ 31.9