Derivative and Hedging Instruments (Schedule of Terms of Interest Rate Cap Agreements) (Details) - USD ($) $ in Millions		Jun. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Interest rate caps, fair value		$ 1.4	$ 2.0
Warehouse Facility II [Member]
Derivative [Line Items]
Debt facility financing amount	[1]	400.0
Warehouse Facility II [Member] | 6.50% Cap Interest Rate [Member]
Derivative [Line Items]
Debt facility financing amount		400.0	400.0
Notional Amount		$ 205.0	$ 205.0
Cap Interest Rate	[2]	6.50%	6.50%
Warehouse Facility IV [Member]
Derivative [Line Items]
Debt facility financing amount	[1]	$ 300.0
Notional Amount		300.0
Warehouse Facility IV [Member] | 6.50% Cap Interest Rate [Member]
Derivative [Line Items]
Debt facility financing amount		300.0	$ 300.0
Notional Amount		$ 25.0	$ 175.0
Cap Interest Rate	[2]	6.50%	6.50%
Warehouse Facility IV [Member] | 7.5% Cap Interest Rate [Member]
Derivative [Line Items]
Notional Amount		$ 275.0
Cap Interest Rate		7.50%
Warehouse Facility V [Member]
Derivative [Line Items]
Debt facility financing amount	[1]	$ 200.0
Warehouse Facility V [Member] | 5.44% Cap Interest Rate [Member]
Derivative [Line Items]
Debt facility financing amount		200.0
Notional Amount		$ 94.0
Cap Interest Rate	[2]	5.44%
Warehouse Facility V [Member] | 5.50% Cap Interest Rate [Member]
Derivative [Line Items]
Debt facility financing amount			$ 200.0
Notional Amount			$ 94.0
Cap Interest Rate	[2]		5.50%
Warehouse Facility VIII [Member]
Derivative [Line Items]
Debt facility financing amount	[1]	$ 200.0
Notional Amount		200.0	$ 200.0
Warehouse Facility VIII [Member] | 5.42% Cap Interest Rate [Member]
Derivative [Line Items]
Debt facility financing amount		200.0
Notional Amount		$ 33.3
Cap Interest Rate	[2]	5.42%
Warehouse Facility VIII [Member] | Additional 5.42% Cap Interest Rate
Derivative [Line Items]
Notional Amount		$ 166.7
Cap Interest Rate	[2]	5.42%
Warehouse Facility VIII [Member] | 5.50% Cap Interest Rate [Member]
Derivative [Line Items]
Debt facility financing amount			200.0
Notional Amount			$ 116.7
Cap Interest Rate	[2]		5.50%
Warehouse Facility VIII [Member] | Additional 5.5% Cap Interest Rate [Member]
Derivative [Line Items]
Notional Amount			$ 83.3
Cap Interest Rate	[2]		5.50%
Term ABS 2021-1 [Member]
Derivative [Line Items]
Debt facility financing amount	[1]	$ 100.0
Term ABS 2021-1 [Member] | 5.46% Cap Interest Rate [Member]
Derivative [Line Items]
Debt facility financing amount		100.0
Notional Amount		$ 75.0
Cap Interest Rate	[2]	5.46%
Term ABS 2021-1 [Member] | 5.50% Cap Interest Rate [Member]
Derivative [Line Items]
Debt facility financing amount			$ 100.0
Notional Amount			$ 100.0
Cap Interest Rate	[2]		5.50%
Term ABS 2022-2 [Member]
Derivative [Line Items]
Debt facility financing amount	[1]	$ 200.0
Term ABS 2022-2 [Member] | 6.50% Cap Interest Rate [Member]
Derivative [Line Items]
Debt facility financing amount		200.0	$ 200.0
Notional Amount		$ 200.0	$ 200.0
Cap Interest Rate	[2]	6.50%	6.50%

[1] Financing made available only to a specified subsidiary of the Company.

[2] Rate excludes the spread over the corresponding benchmark rate.