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Investments - Narrative (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jan. 01, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Gross unrealized gains |  |  | $ 1,900,000 |  | $ 1,900,000 |  | $ 1,200,000
Gross unrealized loss |  |  | 200,000 |  | 200,000 |  | 800,000
Carrying value (fair value) |  |  | 424,600,000 |  | 424,600,000 |  | 273,800,000
Investment In securities |  |  | 232,900,000 | $ 0 | 232,900,000 | $ 61,300,000 |
Provision for credit losses |  | $ 10,200,000 |  |  |  |  |
Financial Asset, Past Due |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Securities past due |  |  | 0 |  | 0 |  | 0
Beneficial interests in securitization trusts |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Provision for credit losses |  | $ (1,700,000) |  |  |  |  |
Reversal of provision for credit losses |  |  | 2,000,000.0 | $ 3,100,000 | 2,000,000.0 | 200,000 |
Beneficial interests in securitization trusts |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Investment in subordinate notes |  |  |  |  | 39,500,000 |  |
Investment in beneficial interests |  |  | 39,500,000 |  |  | 7,100,000 |
Senior notes |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Investment in senior notes |  |  | 170,000,000.0 |  | 170,000,000.0 | 49,600,000 |
Subordinated debt |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Investment in subordinate notes |  |  | 23,500,000 |  | 23,500,000 | $ 4,600,000 |
Beneficial interests in securitization trusts |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Gross unrealized gains |  |  | 0 |  | 0 |  | 0
Gross unrealized loss |  |  | 0 |  | 0 |  | 0
Carrying value (fair value) | [1] |  | 133,484,000 |  | 133,484,000 |  | 91,418,000
Debt securities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Gross unrealized gains |  |  | 1,877,000 |  | 1,877,000 |  | 1,152,000
Gross unrealized loss |  |  | 226,000 |  | 226,000 |  | 777,000
Accumulated net investment gain (loss) attributable to noncontrolling interest |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Gross unrealized gains |  |  | 1,877,000 |  | 1,877,000 |  | 1,152,000
Gross unrealized loss |  |  | $ 226,000 |  | $ 226,000 |  | $ 777,000
[1] | Investments in beneficial interests includes allowance for credit losses of $3.0 million and $4.5 million at June 30, 2021 and December 31, 2020, respectively.

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