Derivative And Hedging Instruments (Schedule Of Terms Of Interest Rate Cap Agreements) (Details) - USD ($) $ in Millions		Dec. 31, 2021		Dec. 31, 2020
Derivative [Line Items]
Interest rate swap fair value		$ 0.2		$ 0.1
Warehouse Facility II [Member]
Derivative [Line Items]
Debt financing amount		400.0	[1],[2]	400.0
Warehouse Facility II [Member] | 5.50% Cap Interest Rate [Member]
Derivative [Line Items]
Derivative, Notional Amount		$ 205.0		$ 205.0
Cap Interest Rate	[3]	5.50%		5.50%
Warehouse Facility IV [Member]
Derivative [Line Items]
Debt financing amount		$ 300.0	[1],[2]	$ 300.0
Derivative, Notional Amount				300.0
Warehouse Facility IV [Member] | 6.50% Cap Interest Rate [Member]
Derivative [Line Items]
Derivative, Notional Amount		$ 300.0		$ 33.3
Cap Interest Rate	[3]	6.50%		6.50%
Warehouse Facility IV [Member] | Additional 6.50% Cap Interest Rate [Member]
Derivative [Line Items]
Derivative, Notional Amount				$ 50.0
Cap Interest Rate	[3]			6.50%
Warehouse Facility IV [Member] | Second Additional 6.50% Cap Interest Rate [Member]
Derivative [Line Items]
Derivative, Notional Amount				$ 216.7
Cap Interest Rate	[3]			6.50%
Warehouse Facility V [Member]
Derivative [Line Items]
Debt financing amount		$ 125.0	[1],[2]	$ 125.0
Warehouse Facility V [Member] | 5.50% Cap Interest Rate [Member]
Derivative [Line Items]
Derivative, Notional Amount		$ 94.0
Cap Interest Rate	[3]	5.50%
Warehouse Facility V [Member] | 6.50% Cap Interest Rate [Member]
Derivative [Line Items]
Derivative, Notional Amount				$ 94.0
Cap Interest Rate	[3]			5.50%
Warehouse Facility VII [Member]
Derivative [Line Items]
Debt financing amount				$ 150.0
Derivative, Notional Amount				150.0
Warehouse Facility VII [Member] | 5.50% Cap Interest Rate [Member]
Derivative [Line Items]
Derivative, Notional Amount				$ 68.7
Cap Interest Rate	[3]			5.50%
Warehouse Facility VII [Member] | Additional 5.50% Cap Interest Rate [Member]
Derivative [Line Items]
Derivative, Notional Amount				$ 81.3
Cap Interest Rate	[3]			5.50%
Warehouse Facility VIII [Member]
Derivative [Line Items]
Debt financing amount		$ 200.0	[1],[2]	$ 200.0
Warehouse Facility VIII [Member] | 5.50% Cap Interest Rate [Member]
Derivative [Line Items]
Derivative, Notional Amount		$ 200.0		$ 200.0
Cap Interest Rate	[3]	5.50%		5.50%
Term ABS 2021-1 [Member]
Derivative [Line Items]
Debt financing amount	[1],[2]	$ 100.0
Term ABS 2021-1 [Member] | 5.50% Cap Interest Rate [Member]
Derivative [Line Items]
Derivative, Notional Amount		$ 100.0
Cap Interest Rate	[3]	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.