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Debt (Schedule Of Outstanding Debt Amount) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 30, 2015
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Principal balance outstanding |  | $ 171.9 | $ 13.9 |  |
Principal balance outstanding |  | 544.4 | 542.8 |  |
Principal balance outstanding |  | 3,092.7 | 2,514.1 |  |
Restricted cash and cash equivalents pledged as collateral |  | 303.6 | 255.6 | $ 224.7 |
Revolving Secured Line Of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal balance outstanding |  | 171.9 | 13.9 |  |
Amount available for borrowing | [1] | $ 178.1 | $ 336.1 |  |
Interest rate |  | 4.38% | 3.44% |  |
Warehouse Facility II [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal balance outstanding |  | $ 0.0 | $ 0.0 |  |
Loans pledged as collateral |  | 0.0 | 0.0 |  |
Restricted cash and cash equivalents pledged as collateral |  | 1.0 | 1.0 |  |
Amount available for borrowing | [1] | $ 400.0 | $ 400.0 |  |
Interest rate |  | 0.00% | 0.00% |  |
Warehouse Facility IV [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal balance outstanding |  |  | $ 0.0 |  |
Loans pledged as collateral |  |  | 0.0 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 1.0 | 1.0 |  |
Amount available for borrowing | [1] | $ 250.0 | $ 100.0 |  |
Interest rate |  | 0.00% | 0.00% |  |
Warehouse Facility V [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal balance outstanding |  | $ 0.0 |  |  |
Loans pledged as collateral |  | 0.0 |  |  |
Restricted cash and cash equivalents pledged as collateral |  | 1.0 | $ 1.0 |  |
Amount available for borrowing | [1] | $ 100.0 | $ 100.0 |  |
Interest rate |  | 0.00% | 0.00% |  |
Warehouse Facility VI [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal balance outstanding |  | $ 0.0 | $ 0.0 |  |
Loans pledged as collateral |  | 0.0 | 0.0 |  |
Restricted cash and cash equivalents pledged as collateral |  | 0.1 | 0.0 |  |
Amount available for borrowing | [1] | $ 75.0 | $ 75.0 |  |
Interest rate |  | 0.00% | 0.00% |  |
Warehouse Facility VII [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal balance outstanding |  | $ 0.0 | $ 0.0 |  |
Loans pledged as collateral |  | 0.0 | 0.0 |  |
Restricted cash and cash equivalents pledged as collateral |  | 1.0 | 1.0 |  |
Amount available for borrowing | [1] | $ 150.0 | $ 150.0 |  |
Interest rate |  | 0.00% | 0.00% |  |
Term ABS 2015-1 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal balance outstanding |  | $ 0.0 | $ 78.0 |  |
Loans pledged as collateral |  | 0.0 | 238.4 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 0.0 | $ 23.3 |  |
Interest rate |  | 0.00% | 0.00% |  |
Term ABS 2015-2 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal balance outstanding |  | $ 0.0 | $ 215.9 |  |
Loans pledged as collateral |  | 0.0 | 313.3 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 0.0 | $ 26.4 |  |
Interest rate |  | 0.00% | 0.00% |  |
Term ABS 2016-1 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal balance outstanding |  | $ 125.3 | $ 385.0 |  |
Loans pledged as collateral |  | 320.8 | 467.2 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 29.6 | $ 36.6 |  |
Interest rate |  | 4.41% | 0.00% |  |
Term ABS 2016-2 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal balance outstanding |  | $ 184.5 | $ 350.2 |  |
Loans pledged as collateral |  | 335.0 | 428.0 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 28.3 | $ 33.2 |  |
Interest rate |  | 3.20% | 0.00% |  |
Term ABS 2016-3 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal balance outstanding |  | $ 300.6 | $ 350.0 |  |
Loans pledged as collateral |  | 392.7 | 425.7 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 30.7 | $ 31.1 |  |
Interest rate |  | 2.59% | 0.00% |  |
Term ABS 2017-1 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal balance outstanding |  | $ 350.0 | $ 350.0 |  |
Loans pledged as collateral |  | 429.8 | 425.9 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 30.9 | $ 30.8 |  |
Interest rate |  | 2.78% | 0.00% |  |
Term ABS 2017-2 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal balance outstanding |  | $ 450.0 | $ 450.0 |  |
Loans pledged as collateral |  | 548.4 | 545.8 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 39.4 | $ 39.8 |  |
Interest rate |  | 2.72% | 0.00% |  |
Term ABS 2017-3 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal balance outstanding |  | $ 350.0 | $ 350.0 |  |
Loans pledged as collateral |  | 426.1 | 482.6 |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 28.6 | $ 29.6 |  |
Interest rate |  | 2.88% | 0.00% |  |
Term ABS 2018-1 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal balance outstanding |  | $ 500.0 |  |  |
Loans pledged as collateral |  | 614.5 |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 41.8 |  |  |
Interest rate |  | 3.24% |  |  |
Term ABS 2018-2 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal balance outstanding |  | $ 450.0 |  |  |
Loans pledged as collateral |  | 552.2 |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 36.3 |  |  |
Interest rate |  | 3.68% |  |  |
Term ABS 2018-3 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal balance outstanding |  | $ 398.3 |  |  |
Loans pledged as collateral |  | 578.8 |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 33.6 |  |  |
Interest rate |  | 3.72% |  |  |
2021 Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal balance outstanding |  | $ 300.0 | $ 300.0 |  |
Interest rate |  | 6.125% | 6.125% |  |
2023 Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal balance outstanding |  | $ 250.0 | $ 250.0 |  |
Interest rate |  | 7.375% | 7.375% |  | 7.50%
Mortgage [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal balance outstanding |  | $ 11.9 | $ 0.0 |  |
Interest rate |  | 3.85% | 0.00% |  |
[1] | Availability may be limited by the amount of assets pledged as collateral.

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