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Long-Term Debt - Schedule of Components of Long-Term Debt (Details) - USD ($) | 3 Months Ended
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Sep. 30, 2021 | Jun. 30, 2021
Debt Instrument [Line Items] |  |
Borrowings | $ 1,510,056,000 |
Unamortized Deferred Issuance Costs / Discount | (10,479,000) |
Net Carrying Value | 1,499,577,000 |
Facilities |  |
Debt Instrument [Line Items] |  |
Borrowings | 849,635,000 |
Unamortized Deferred Issuance Costs / Discount | (1,746,000) |
Net Carrying Value | 847,889,000 |
Trust preferred securities and subordinated notes |  |
Debt Instrument [Line Items] |  |
Borrowings | 139,500,000 |
Unamortized Deferred Issuance Costs / Discount | (791,000) |
Net Carrying Value | $ 138,709,000 |
Trust preferred securities and subordinated notes | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 2.25% |
Non-Recourse Business Purpose Loans |  |
Debt Instrument [Line Items] |  |
Repayments of debt |  | $ 242,000,000
Sequoia | Recourse Subordinate Securities Financing | Affiliated Entity |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 147,182,000 |
Unamortized Deferred Issuance Costs / Discount | (417,000) |
Net Carrying Value | $ 146,765,000 |
Weighted Average Interest Rate (as a percent) | 4.21% |
Facility A | Recourse Subordinate Securities Financing | Affiliated Entity |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 102,370,000 |
Unamortized Deferred Issuance Costs / Discount | (429,000) |
Net Carrying Value | $ 101,941,000 |
Weighted Average Interest Rate (as a percent) | 4.21% |
Facility B | Recourse Subordinate Securities Financing | Affiliated Entity |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 95,011,000 |
Unamortized Deferred Issuance Costs / Discount | (439,000) |
Net Carrying Value | $ 94,572,000 |
Weighted Average Interest Rate (as a percent) | 4.75% |
Non-Recourse BPL Financing, Facility D | Facilities |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 105,961,000 |
Unamortized Deferred Issuance Costs / Discount | (320,000) |
Net Carrying Value | 105,641,000 |
Limit | $ 250,000,000 |
Non-Recourse BPL Financing, Facility D | Facilities | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.00% |
Recourse BPL Financing, Facility E | Facilities |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 168,228,000 |
Unamortized Deferred Issuance Costs / Discount | 0 |
Net Carrying Value | 168,228,000 |
Limit | $ 450,000,000 |
Recourse BPL Financing, Facility E | Facilities | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.10% |
Recourse BPL Financing, Facility F | Facilities |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 230,883,000 |
Unamortized Deferred Issuance Costs / Discount | (141,000) |
Net Carrying Value | 230,742,000 |
Limit | $ 250,000,000 |
Recourse BPL Financing, Facility F | Facilities | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 3.00% |
4.75% convertible senior notes | Convertible notes |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 198,629,000 |
Unamortized Deferred Issuance Costs / Discount | (2,098,000) |
Net Carrying Value | $ 196,531,000 |
Weighted Average Interest Rate (as a percent) | 4.75% |
5.625% convertible senior notes | Convertible notes |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 150,200,000 |
Unamortized Deferred Issuance Costs / Discount | (2,262,000) |
Net Carrying Value | $ 147,938,000 |
Weighted Average Interest Rate (as a percent) | 5.625% |
5.75% exchangeable senior notes | Convertible notes |  |
Debt Instrument [Line Items] |  |
Borrowings | $ 172,092,000 |
Unamortized Deferred Issuance Costs / Discount | (3,582,000) |
Net Carrying Value | $ 168,510,000 |
Weighted Average Interest Rate (as a percent) | 5.75% |

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