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Debt (Summary of Debt) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Dec. 18, 2019
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Balance outstanding |  | $ 0.0 | $ 95.9 |  |  |
Secured Debt |  | 3,978.5 | 3,711.6 |  |  |
Balance outstanding |  | 791.5 | 790.6 |  |  |
Restricted cash and cash equivalents pledged as collateral |  | 477.4 | 380.2 | $ 382.7 | $ 330.3 |
Mortgage note | [1] | 10.1 | 10.5 |  |  |
Revolving Secured Line of Credit [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Balance outstanding |  | 0.0 | 95.9 |  |  |
Amount available for borrowing | [2] | $ 340.0 | $ 244.1 |  |  |
Interest rate |  | 0.00% | 2.02% |  |  |
Warehouse Facility II [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt |  | $ 0.0 | $ 75.0 |  |  |
Amount available for borrowing | [2] | 400.0 | 325.0 |  |  |
Loans pledged as collateral |  | 0.0 | 91.8 |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 1.0 | $ 3.0 |  |  |
Interest rate |  | 0.00% | 1.90% |  |  |
Warehouse Facility IV [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt |  | $ 0.0 | $ 0.0 |  |  |
Amount available for borrowing | [2] | 300.0 | 300.0 |  |  |
Loans pledged as collateral |  | 0.0 | 0.0 |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 1.0 | $ 1.0 |  |  |
Interest rate |  | 0.00% | 0.00% |  |  |
Warehouse Facility V [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt |  | $ 0.0 | $ 0.0 |  |  |
Amount available for borrowing | [2] | 125.0 | 125.0 |  |  |
Loans pledged as collateral |  | 0.0 | 0.0 |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 1.0 | $ 1.0 |  |  |
Interest rate |  | 0.00% | 0.00% |  |  |
Warehouse Facility VI [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt |  | $ 0.0 | $ 0.0 |  |  |
Amount available for borrowing | [2] | 75.0 | 75.0 |  |  |
Loans pledged as collateral |  | 0.0 |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 0.0 | $ 0.0 |  |  |
Interest rate |  | 0.00% | 0.00% |  |  |
Warehouse Facility VII [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt |  | $ 0.0 | $ 0.0 |  |  |
Amount available for borrowing | [2] | 150.0 | 150.0 |  |  |
Loans pledged as collateral |  | 0.0 | 0.0 |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 1.0 | $ 1.0 |  |  |
Interest rate |  | 0.00% | 0.00% |  |  |
Warehouse Facility VIII [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt |  | $ 0.0 | $ 0.0 |  |  |
Amount available for borrowing | [2] | 200.0 | 200.0 |  |  |
Loans pledged as collateral |  | 0.0 | 0.0 |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 0.0 | $ 0.0 |  |  |
Interest rate |  | 0.00% | 0.00% |  |  |
Term ABS 2017-3 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt |  | $ 0.0 | $ 70.9 |  |  |
Loans pledged as collateral |  | 0.0 | 215.8 |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 0.0 | $ 23.2 |  |  |
Interest rate |  | 0.00% | 3.41% |  |  |
Term ABS 2018-1 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt |  | $ 0.0 | $ 196.4 |  |  |
Loans pledged as collateral |  | 0.0 | 394.1 |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 0.0 | $ 36.2 |  |  |
Interest rate |  | 0.00% | 3.61% |  |  |
Term ABS 2018-2 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt |  | $ 96.7 | $ 254.3 |  |  |
Loans pledged as collateral |  | 305.9 | 410.0 |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 36.1 | $ 34.6 |  |  |
Interest rate |  | 4.11% | 3.85% |  |  |
Term ABS 2018-3 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt |  | $ 141.9 | $ 296.1 |  |  |
Loans pledged as collateral |  | 306.7 | 408.8 |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 34.1 | $ 32.9 |  |  |
Interest rate |  | 3.98% | 3.78% |  |  |
Term ABS 2019-1 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt |  | $ 278.3 | $ 402.5 |  |  |
Loans pledged as collateral |  | 393.4 | 482.3 |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 39.5 | $ 35.4 |  |  |
Interest rate |  | 3.61% | 3.53% |  |  |
Term ABS 2019-2 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt |  | $ 500.0 | $ 500.0 |  |  |
Loans pledged as collateral |  | 578.6 | 575.4 |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 52.4 | $ 41.2 |  |  |
Interest rate |  | 3.13% | 3.13% |  |  |
Term ABS 2019-3 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt |  | $ 351.7 | $ 351.7 |  |  |
Loans pledged as collateral |  | 410.1 | 420.9 |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 37.7 | $ 30.8 |  |  |
Interest rate |  | 2.56% | 2.56% |  |  |
Term ABS 2020-1 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt |  | $ 500.0 | $ 500.0 |  |  |
Loans pledged as collateral |  | 619.9 | 749.3 |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 55.3 | $ 48.8 |  |  |
Interest rate |  | 2.18% | 2.18% |  |  |
Term ABS 2020-2 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt |  | $ 481.8 | $ 481.8 |  |  |
Loans pledged as collateral |  | 585.2 | 606.6 |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 50.4 | $ 41.1 |  |  |
Interest rate |  | 1.65% | 1.65% |  |  |
Term ABS 2020-3 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt |  | $ 600.0 | $ 600.0 |  |  |
Loans pledged as collateral |  | 719.3 | 759.1 |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 59.4 | $ 49.3 |  |  |
Interest rate |  | 1.44% | 1.44% |  |  |
Term ABS 2021-1 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt |  | $ 100.0 |  |  |  |
Loans pledged as collateral |  | 156.0 |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 10.8 |  |  |  |
Interest rate |  | 2.07% |  |  |  |
Term ABS 2021-2 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt |  | $ 500.0 |  |  |  |
Loans pledged as collateral |  | 702.0 |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 52.7 |  |  |  |
Interest rate |  | 1.12% |  |  |  |
2024 Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Balance outstanding |  | $ 400.0 | $ 400.0 |  |  | $ 400.0
Interest rate |  | 5.125% | 5.125% |  |  | 5.125%
2026 Senior Notes [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Balance outstanding |  | $ 400.0 | $ 400.0 |  |  |
Interest rate |  | 6.625% | 6.625% |  |  |
Mortgages [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate |  | 1.59% | 1.65% |  |  |
Mortgage note |  | $ 10.1 | $ 10.5 |  |  |
TermAssetBackedSecuredFinancingsTwoThousandTwentyOneThree |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Secured Debt |  | 450.0 |  |  |  |
Loans pledged as collateral |  | 632.7 |  |  |  |
Restricted cash and cash equivalents pledged as collateral |  | $ 44.3 |  |  |  |
Interest rate |  | 1.14% |  |  |  |
[1] | Measured at amortized cost with fair value disclosed.
[2] | Availability may be limited by the amount of assets pledged as collateral.

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