Borrowings - Narrative (Details) $ / shares in Units, shares in Millions, $ in Millions			1 Months Ended	3 Months Ended	12 Months Ended
	Dec. 31, 2022 USD ($)	Aug. 20, 2021 USD ($) day $ / shares shares	May 31, 2020 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jan. 31, 2023 USD ($)
ULT Warehouse Credit Facility | Revolving Credit Facility
Schedule of Borrowings [Line Items]
Maximum borrowing capacity			$ 175.0
Redemption price (in percent)			100.00%
Maximum advance rate (in percent)	72.50%			72.50%	72.50%
ULT Warehouse Credit Facility | Minimum | Revolving Credit Facility
Schedule of Borrowings [Line Items]
Monthly unused fee (in percent)			0.20%
ULT Warehouse Credit Facility | Maximum | Revolving Credit Facility
Schedule of Borrowings [Line Items]
Monthly unused fee (in percent)			1.00%
ULT Warehouse Credit Facility - Committed | Revolving Credit Facility
Schedule of Borrowings [Line Items]
Maximum borrowing capacity			$ 100.0
ULT Warehouse Credit Facility - Uncommitted | Revolving Credit Facility
Schedule of Borrowings [Line Items]
Maximum borrowing capacity			$ 75.0
UAWT Warehouse Credit Facility | Revolving Credit Facility
Schedule of Borrowings [Line Items]
Monthly unused fee (in percent)	0.50%
Maximum advance rate (in percent)	82.50%				82.50%
UAWT Warehouse Credit Facility | Revolving Credit Facility | Primary Beneficiary
Schedule of Borrowings [Line Items]
Maximum borrowing capacity	$ 200.0				$ 200.0	$ 200.0
Maximum advance rate					80.00%
2026 ("Notes")
Schedule of Borrowings [Line Items]
Convertible notes payable	649.9			$ 650.7	$ 649.9
Purchase of capped calls		$ 58.5
Initial conversion price (in dollars per share) | $ / shares		$ 285.26
Initial cap price (in dollars per share) | $ / shares		$ 400.36
Capped call cover (in shares) | shares		2.3
2026 ("Notes") | Fair Value, Inputs, Level 2
Schedule of Borrowings [Line Items]
Fair value of convertible senior notes	$ 364.8			375.0	$ 364.8
2026 ("Notes") | Convertible Debt
Schedule of Borrowings [Line Items]
Aggregate principal amount		$ 661.3
Stated interest rate		0.25%
Additional aggregate principal		$ 86.3
Net proceeds from sale of the notes		$ 645.5
Initial conversion rate (in shares)		0.003506
Initial conversion price (in dollars per share) | $ / shares		$ 285.26
Percent of the principal amount		100.00%
2026 ("Notes") | Convertible Debt | Conversion Period One
Schedule of Borrowings [Line Items]
Trading days | day		20
Consecutive trading days | day		30
Conversion price maximum threshold		130.00%
2026 ("Notes") | Convertible Debt | Conversion Period Two
Schedule of Borrowings [Line Items]
Trading days | day		5
Consecutive trading days | day		5
Percentage of the last reported sale price		98.00%
2026 ("Notes") | Convertible Debt | Conversion Period Three
Schedule of Borrowings [Line Items]
Redemption price (in percent)		100.00%
Trading days | day		20
Consecutive trading days | day		30
Conversion price maximum threshold		130.00%
Gross debt issuance cost		$ 15.7
Amortization of debt issuance costs				$ 0.8
Effective interest rate				0.70%
Secured Overnight Financing Rate | ULT Warehouse Credit Facility | Minimum | Revolving Credit Facility
Schedule of Borrowings [Line Items]
Basis spread on variable rate			1.90%
Secured Overnight Financing Rate | ULT Warehouse Credit Facility | Maximum | Revolving Credit Facility
Schedule of Borrowings [Line Items]
Basis spread on variable rate			3.28%
Weighted-Average Cost Of Commercial Paper Notes Issued By The Lender | UAWT Warehouse Credit Facility | Minimum | Revolving Credit Facility
Schedule of Borrowings [Line Items]
Basis spread on variable rate	2.20%
Weighted-Average Cost Of Commercial Paper Notes Issued By The Lender | UAWT Warehouse Credit Facility | Maximum | Revolving Credit Facility
Schedule of Borrowings [Line Items]
Basis spread on variable rate	3.50%
UAWT Benchmark Rate | UAWT Warehouse Credit Facility | Minimum | Revolving Credit Facility | Primary Beneficiary
Schedule of Borrowings [Line Items]
Basis spread on variable rate					3.00%
UAWT Benchmark Rate | UAWT Warehouse Credit Facility | Maximum | Revolving Credit Facility | Primary Beneficiary
Schedule of Borrowings [Line Items]
Basis spread on variable rate					4.00%