Derivative and Hedging Instruments (Schedule of Terms of Interest Rate Cap Agreements) - USD ($) $ in Millions		Mar. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Interest rate caps, fair value		$ 1.4	$ 0.2
Warehouse Facility II [Member]
Derivative [Line Items]
Debt facility financing amount	[1],[2]	400.0
Warehouse Facility II [Member] | 5.50% Cap Interest Rate [Member]
Derivative [Line Items]
Debt facility financing amount		400.0	400.0
Notional Amount		$ 205.0	$ 205.0
Cap Interest Rate	[3]	5.50%	5.50%
Warehouse Facility IV [Member]
Derivative [Line Items]
Debt facility financing amount	[1],[2]	$ 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		$ 300.0	$ 300.0
Cap Interest Rate	[3]	6.50%	6.50%
Warehouse Facility V [Member]
Derivative [Line Items]
Debt facility financing amount	[1],[2]	$ 125.0
Warehouse Facility V [Member] | 5.50% Cap Interest Rate [Member]
Derivative [Line Items]
Debt facility financing amount		125.0	$ 125.0
Notional Amount		$ 94.0	$ 94.0
Cap Interest Rate	[3]	5.50%	5.50%
Warehouse Facility VIII [Member]
Derivative [Line Items]
Debt facility financing amount	[1],[2]	$ 200.0
Warehouse Facility VIII [Member] | 5.50% Cap Interest Rate [Member]
Derivative [Line Items]
Debt facility financing amount		200.0	$ 200.0
Notional Amount		$ 200.0	$ 200.0
Cap Interest Rate	[3]	5.50%	5.50%
Term ABS 2021-1 [Member]
Derivative [Line Items]
Debt facility financing amount	[1]	$ 100.0
Term ABS 2021-1 [Member] | 5.50% Cap Interest Rate [Member]
Derivative [Line Items]
Debt facility financing amount		100.0	$ 100.0
Notional Amount		$ 100.0	$ 100.0
Cap Interest Rate		5.50%	5.50%

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

[2] Interest rate cap agreements are in place to limit the exposure to increasing interest rates

[3] Rate excludes the spread over the corresponding LIBOR or commercial paper rate.