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Long-Term Debt - Schedule of Components of Long-Term Debt (Details) - USD ($)	3 Months Ended
	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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