Long Term Debt - Additional Information (Details)		1 Months Ended	3 Months Ended	6 Months Ended
	Jun. 18, 2021 USD ($) d $ / shares shares	Jul. 31, 2003 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Debt instrument aggregate principal amount			$ 169,830,000	$ 169,830,000
Net proceeds from offering, after deducting commissions paid to initial purchasers and debt issuance costs paid to third-parties					$ 625,000,000
Estimated fair value of notes			167,115,000	167,115,000
Restricted cash			153,741,000	153,741,000		$ 82,450,000
Expected payments, 2022			52,300,000	52,300,000
Expected payments, 2023			72,700,000	72,700,000
Expected payments, 2024			33,000,000.0	33,000,000.0
Expected payments, 2025			11,600,000	11,600,000
Junior subordinated debentures		$ 10,000,000.0
Junior Subordinated Debentures
Debt Instrument [Line Items]
Long-term debt, maturity date		Oct. 07, 2033
Percentage of owned finance subsidiary		100.00%
LIBOR | Junior Subordinated Debentures
Debt Instrument [Line Items]
Period of LIBOR measurement		3 months
Variable interest rate		3.05%
Securitization Debt of Consolidated VIEs
Debt Instrument [Line Items]
Restricted cash			20,500,000	$ 20,500,000
0.75% Unsecured Convertible Senior Notes Due 2026
Debt Instrument [Line Items]
Debt instrument aggregate principal amount	$ 625,000,000.0
Debt instrument interest rate	0.75%
Aggregate principal amount exercise in overallotment option granted to initial purchasers	$ 75,000,000.0
Long-term debt, frequency of periodic payment				semiannually
Long-term debt, beginning date of payment	Jan. 01, 2022
Long-term debt, maturity date	Jul. 01, 2026
Long-term debt payment terms				The Notes bear interest at a rate of 0.75% per annum, payable semiannually in arrears on January 1 and July 1 of each year, beginning on January 1, 2022.
Net proceeds from offering, after deducting commissions paid to initial purchasers and debt issuance costs paid to third-parties	$ 608,900,000
Debt conversion, each principal amount initially be convertible	$ 1,000
Initial conversion price per share | $ / shares	$ 56.01
Debt instrument conversion date	Apr. 01, 2026
Unamortized debt discount and debt issuance costs			12,800,000	$ 12,800,000
Net carrying value of debt			612,200,000	612,200,000
Interest expense			$ 2,000,000.0	$ 4,000,000.0
Effective interest rate			1.30%	1.30%
0.75% Unsecured Convertible Senior Notes Due 2026 | During any Fiscal Quarter Commencing After Fiscal Quarter Ending on September 30, 2021
Debt Instrument [Line Items]
Consecutive trading days | d	30
0.75% Unsecured Convertible Senior Notes Due 2026 | During any Fiscal Quarter Commencing After Fiscal Quarter Ending on September 30, 2021 | Minimum
Debt Instrument [Line Items]
Trading days | d	20
Conversion price	130.00%
0.75% Unsecured Convertible Senior Notes Due 2026 | During Five Consecutive Business Day Period After any Ten Consecutive Trading Day Period
Debt Instrument [Line Items]
Debt conversion, each principal amount initially be convertible	$ 1,000
Consecutive trading days | d	10
0.75% Unsecured Convertible Senior Notes Due 2026 | During Five Consecutive Business Day Period After any Ten Consecutive Trading Day Period | Maximum
Debt Instrument [Line Items]
Conversion price	98.00%
0.75% Unsecured Convertible Senior Notes Due 2026 | Company May Redeem On or after July 6, 2024
Debt Instrument [Line Items]
Consecutive trading days | d	30
Redemption percentage of principal amount	100.00%
0.75% Unsecured Convertible Senior Notes Due 2026 | Company May Redeem On or after July 6, 2024 | Minimum
Debt Instrument [Line Items]
Trading days | d	20
Conversion price	130.00%
0.75% Unsecured Convertible Senior Notes Due 2026 | Common Stock
Debt Instrument [Line Items]
Debt conversion, for each principal amount conversion to shares | shares	17.8527