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Derivative And Hedging Instruments (Schedule Of Terms Of Interest Rate Cap Agreements) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Derivative [Line Items] |  |  |  |
Secured financing |  | $ 3,092.7 |  | $ 2,514.1
Interest rate swap fair value |  | 0.0 |  | 0.0
Warehouse Facility II [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt financing amount |  | 400.0 | [1] | 400.0
Secured financing |  | 0.0 |  | 0.0
Warehouse Facility II [Member] | 5.50% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional value |  | $ 205.0 |  | $ 205.0
Cap Interest Rate | [2] | 5.50% |  | 5.50%
Warehouse Facility IV [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt financing amount |  | $ 250.0 | [1] | $ 100.0
Notional value |  | 250.0 |  | 100.0
Secured financing |  |  |  | 0.0
Warehouse Facility IV [Member] | 5.50% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional value |  | $ 25.0 |  | $ 75.0
Cap Interest Rate | [2] | 5.50% |  | 5.50%
Warehouse Facility IV [Member] | Original 6.5% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional value |  | $ 75.0 |  |
Cap Interest Rate | [2] | 6.50% |  |
Warehouse Facility IV [Member] | Additional 6.5% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional value |  | $ 150.0 |  |
Cap Interest Rate | [2] | 6.50% |  |
Warehouse Facility IV [Member] | 6.50% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional value |  |  |  | $ 25.0
Cap Interest Rate | [2] |  |  | 6.50%
Warehouse Facility V [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt financing amount |  | $ 100.0 | [1] | $ 100.0
Secured financing |  | 0.0 |  |
Warehouse Facility V [Member] | 5.50% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional value |  |  |  | $ 75.0
Cap Interest Rate | [2] |  |  | 5.50%
Warehouse Facility V [Member] | 6.50% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional value |  | $ 75.0 |  |
Cap Interest Rate | [2] | 6.50% |  |
Term ABS 2016-1 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt financing amount |  | $ 385.0 | [1] | $ 385.0
Secured financing |  | 125.3 |  | 385.0
Term ABS 2016-1 [Member] | 5.00% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional value |  | $ 64.2 |  | $ 385.0
Cap Interest Rate | [2] | 5.00% |  | 5.00%
Secured financing |  | $ 125.3 |  |
Warehouse Facility VII [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Debt financing amount |  | 150.0 | [1] | $ 150.0
Secured financing |  | 0.0 |  | 0.0
Warehouse Facility VII [Member] | 5.50% Cap Interest Rate [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Notional value |  | $ 150.0 |  | $ 150.0
Cap Interest Rate | [2] | 5.50% |  | 5.50%
[1] | Interest rate cap agreements are in place to limit the exposure to increasing interest rates.
[2] | Rate excludes the spread over the LIBOR rate.

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