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Supplemental Financial Statement Information - Additional Information (Details) - USD ($)		3 Months Ended		12 Months Ended
	Apr. 22, 2021	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Effects of Reinsurance
Marketable equity securities		$ 9,800,000
Cash and cash equivalents and short-term investments		2,200,000,000		$ 2,300,000,000
Restricted cash and cash equivalents and restricted short-term investments		948,100,000		1,100,000,000
Allowance for credit loss on marketable and non-marketable available for sale debt securities		0
Transfer of certain legacy auto insurance liabilities		0	$ 0
Deferred gain related to the Reinsurance Transaction		108,053,000		52,785,000
Cost of revenue
Effects of Reinsurance
Loss recognized from net cost of novation agreement				20,200,000
General and administrative
Effects of Reinsurance
Loss recognized from net cost of novation agreement				200,000
DARAG Bermuda LTD
Effects of Reinsurance
Reserves for current period	$ 183,200,000
Reinsurance recoverables	251,300,000
Funds withheld	271,500,000
Funds withheld liability balance included in accrued and other current liabilities	20,200,000
DARAG Bermuda LTD | Pacific Valley Insurance Company, Inc.
Effects of Reinsurance
Transfer of certain legacy auto insurance liabilities	251,300,000
Reinsurance obligations	434,500,000
Unearned premiums	271,500,000
Insurance liability, collateralized amount	$ 75,000,000
Loss recognized from net cost of novation agreement		20,400,000
Cash and Cash Equivalents and Short-Term Investments
Effects of Reinsurance
Cash		48,100,000		104,800,000
Restricted Cash and Cash Equivalents and Restricted Investments
Effects of Reinsurance
Restricted cash		$ 53,200,000		$ 53,700,000

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