DISCONTINUED OPERATIONS - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring charges	$ 31,739,000	$ 0	$ 0
Statutory capital and surplus	55,000,000	88,300,000
Required statutory capital and surplus	63,100,000	33,300,000
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring charges	50,704,000
Bright Healthcare – Commercial Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Medical costs	(50,200,000)
Accounts payable	47,100,000	40,700,000
Bright Healthcare – Commercial Segment | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring charges	44,591,000
Impairment of available-for-sale securities	67,700,000
Bright Healthcare – Commercial Segment | Discontinued Operations | Broker Commissions Payable
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Broker commissions payable	21,100,000
Bright Healthcare – Commercial Segment | Discontinued Operations | Contract Termination Costs
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring charges	28,538,000
Broker commissions payable		0
Contract termination costs	28,538,000	0
Bright Healthcare – Commercial Segment | Minimum | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring and related cost, expect to incur incurred cost	5,000,000
Bright Healthcare – Commercial Segment | Maximum | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Restructuring and related cost, expect to incur incurred cost	10,000,000
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Statutory capital and surplus	12,900,000	310,200,000
Discontinued Operations | Bright Healthcare – Commercial Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Risk adjustment payable	1,943,890,000	931,170,000
Discontinued Operations | Level 1 | Bright Healthcare – Commercial Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash, cash equivalents, and short-term investments	940,500,000	412,100,000
Discontinued Operations | Level 2 | Bright Healthcare – Commercial Segment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash, cash equivalents, and short-term investments	$ 802,700,000	$ 477,900,000