Long Term Debt - Additional Information (Details)		1 Months Ended		3 Months Ended		6 Months Ended	9 Months Ended
	Jun. 18, 2021 USD ($) d $ / shares shares	Sep. 30, 2022 USD ($)	Jul. 31, 2003 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2022	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Debt Instrument [Line Items]
Debt instrument aggregate principal amount		$ 98,484,000		$ 98,484,000			$ 98,484,000
Net proceeds from offering, after deducting commissions paid to initial purchasers and debt issuance costs paid to third-parties								$ 625,000,000
Aggregate principal amount		127,270,000		127,270,000			127,270,000
Gain on debt extinguishment				37,917,000			37,917,000
Estimated fair value of notes		95,494,000		95,494,000			95,494,000
Restricted cash		94,305,000		94,305,000			94,305,000		$ 82,450,000
Expected payments, 2022		15,100,000		15,100,000			15,100,000
Expected payments, 2023		45,700,000		45,700,000			45,700,000
Expected payments, 2024		25,700,000		25,700,000			25,700,000
Expected payments, 2025		11,500,000		11,500,000			11,500,000
Redemption price							176,909,000
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		10,100,000		10,100,000			10,100,000
Redemption price		46,900,000
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
Aggregate principal amount		56,400,000		56,400,000			56,400,000
Deferred issuance costs		1,100,000		1,100,000			1,100,000
Repurchase of notes in open-market transaction		18,500,000		18,500,000			18,500,000
Gain on debt extinguishment				37,900,000			37,900,000
Unamortized debt discount and debt issuance costs		10,900,000		10,900,000			10,900,000
Net carrying value of debt		$ 556,600,000		556,600,000			556,600,000
Interest expense				$ 1,900,000	$ 2,000,000.0		$ 5,900,000	$ 2,300,000
Effective interest rate		1.30%		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