EQUITY AND LONG-TERM INVESTMENTS AND FAIR VALUE MEASUREMENTS - Equity Investment in Armata (Details) - Armata $ / shares in Units, $ in Millions		3 Months Ended			12 Months Ended
	Feb. 09, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) shares	Mar. 31, 2021 USD ($) $ / shares shares	Mar. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) Tranche Director	Dec. 31, 2021 USD ($)
Equity Investment
Number of tranches | Tranche					2
Percentage of maximum voting rights	49.50%				49.50%
Number of Investee's Board members currently representing the Company | Director					3
Number of the Investee's Board members | Director					8
Unrealized gain						$ 78.7
Unrealized loss					$ 152.5
Special terms on re-designating board member to board of investee	In addition, as of February 9, 2022, Armata entered into an amended and restated investor rights agreement with the Company and ISO, pursuant to which for as long as the Company and ISO hold at least 12.5% of the outstanding shares of Armata’s common stock on a fully-diluted, the Company and ISO shall have the right to designate two directors to Armata’s board of directors, and for so long as the Company and ISO hold at least 8%, but less than 12.5%, of the outstanding shares of Armata’s common stock on a fully-diluted basis, the Company and ISO shall have the right to designate one director to Armata’s board of directors, subject to certain conditions and qualifications set forth in the amended and restated investor rights agreement.
Consolidated Investees [Member]
Equity Investment
Equity method investment ownership percentage		59.30%			69.40%	59.30%
Two Directors
Equity Investment
Armata outstanding shares percentage	12.50%
Common stock and warrants
Equity Investment
Amount of securities purchase agreement				$ 25.0
Equity and long-term investments at fair value		$ 146.7			$ 39.2	$ 146.7
Warrants purchased in 2020
Equity Investment
Number of warrants purchased under the securities purchase agreement | shares				8,710,800
Exercise price of warrants | $ / shares				$ 2.87
Term of warrants				5 years
Warrants purchased in 2021
Equity Investment
Exercise price of warrants | $ / shares			$ 3.25
Term of warrants			5 years
Warrants Purchased in 2022
Equity Investment
Exercise price of warrants | $ / shares	$ 5.00
Term of warrants	5 years
Warrants
Equity Investment
Equity and long-term investments at fair value		58.6			8.1	58.6
Common stock
Equity Investment
Number of shares to be purchased under the securities purchase agreement | shares				8,710,800
Equity and long-term investments at fair value		$ 88.1			$ 31.1	$ 88.1
Minimum [Member] | One Director
Equity Investment
Armata outstanding shares percentage	8.00%
Maximum [Member] | One Director
Equity Investment
Armata outstanding shares percentage	12.50%
Innoviva Strategic Opportunities, LLC | Common stock and warrants
Equity Investment
Amount of securities purchase agreement	$ 45.0		$ 20.0
Innoviva Strategic Opportunities, LLC | Warrants
Equity Investment
Number of warrants to be purchased under the securities purchase agreement | shares	4,500,000		6,153,847
Exercise price of warrants | $ / shares	$ 5.00
Innoviva Strategic Opportunities, LLC | Common stock
Equity Investment
Number of shares to be purchased under the securities purchase agreement | shares	9,000,000
Number of shares to be purchased under the securities purchase agreement | shares		1,212,122
Number of warrants to be purchased under the securities purchase agreement | shares			6,153,847
Amount of securities purchase agreement		$ 4.0