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Transactions - Passport (Details) - USD ($)						1 Months Ended	3 Months Ended	6 Months Ended
	Dec. 31, 2020	Nov. 16, 2020	Sep. 01, 2020	Jun. 06, 2019	May 28, 2019	Jan. 31, 2021	Mar. 31, 2021	Jun. 30, 2021	Jun. 30, 2020	Dec. 30, 2019	Jun. 18, 2019
Business Acquisition [Line Items]
Payments to redeem Sponsors' equity								$ 1,300,000	$ 0
Passport Asset Acquisition
Business Acquisition [Line Items]
Cash and equivalents			$ 159,800,000
Debt securities, available-for-sale			88,600,000
Receivables related to unsettled sales of securities			43,000,000.0
Other assets			50,200,000
Accrued medical expenses			164,800,000
Accrued liabilities			50,000,000.0
Molina
Business Acquisition [Line Items]
Asset Purchase Agreement, escrow payments			$ 20,000,000.0
Cash Released From Escrow						$ 20,000,000.0
Passport Note
Business Acquisition [Line Items]
Interest rate											6.50%
Proceeds from collection of notes receivable	$ 40,000,000.0
Proceeds from interest received	$ 3,600,000
Passport Note | Notes Receivable
Business Acquisition [Line Items]
Notes receivable, net											$ 40,000,000.0
Passport | Variable Interest Entity, Not Primary Beneficiary
Business Acquisition [Line Items]
Payments to acquire interest					$ 70,000,000.0
Interest in investment		30.00%	30.00%		30.00%
Performance bond amount				$ 25,000,000.0
Payments to acquire equity method investments, amount held back										$ 16,200,000
Payments to redeem Sponsors' equity		$ 20,000,000.0
Proceeds from transfer of membership							$ 23,000,000.0
Transfer of membership, percentage of payment based on number of enrollees							50.00%
Transfer of membership, percentage of payment subject to satisfaction of contingencies								50.00%

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