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Debt - Schedule of Carrying Value of Debt (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Total debt	$ 1,755,000,000	$ 1,697,000,000
Convertible senior notes
Debt Instrument [Line Items]
Total convertible senior notes	1,664,000,000	1,660,000,000
Convertible senior notes | 1.375% convertible senior notes due 2026
Debt Instrument [Line Items]
Total convertible senior notes	$ 496,000,000	495,000,000
Stated Interest Rate	1.375%
Convertible senior notes | 2.75% convertible senior notes due 2025
Debt Instrument [Line Items]
Total convertible senior notes	$ 561,000,000	560,000,000
Stated Interest Rate	2.75%
Convertible senior notes | 0.75% convertible senior notes due 2024
Debt Instrument [Line Items]
Total convertible senior notes	$ 607,000,000	605,000,000
Stated Interest Rate	0.75%
Credit facilities
Debt Instrument [Line Items]
Warehouse line of credit	$ 91,000,000	37,000,000
Line of Credit | Credit facilities
Debt Instrument [Line Items]
Maximum Borrowing Capacity	200,000,000
JPMorgan Chase Bank, N.A. | Credit facilities
Debt Instrument [Line Items]
Repurchase agreements	68,000,000	0
JPMorgan Chase Bank, N.A. | Line of Credit | Credit facilities
Debt Instrument [Line Items]
Maximum Borrowing Capacity	100,000,000
Repurchase agreement committed amount	25,000,000
Atlas Securitized Products, L.P. | Credit facilities
Debt Instrument [Line Items]
Repurchase agreements	22,000,000	23,000,000
Atlas Securitized Products, L.P. | Line of Credit | Credit facilities
Debt Instrument [Line Items]
Maximum Borrowing Capacity	50,000,000
Citibank, N.A. | Credit facilities
Debt Instrument [Line Items]
Repurchase agreements	0	3,000,000
Comerica Bank | Line of Credit | Credit facilities
Debt Instrument [Line Items]
Warehouse line of credit	1,000,000	$ 11,000,000
Maximum Borrowing Capacity	$ 50,000,000

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Contractual interest rate for funds borrowed, under the debt agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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