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Investments - Other Asset Management Companies - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Feb. 29, 2024	Nov. 30, 2024	Jul. 31, 2024	Nov. 30, 2023
Hildene Insurance Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Equity investments			$ 25.0
Funded equity commitments		$ 27.5
Percent of financial information presented		100.00%
Ownership percentage		9.26%
Monashee
Schedule of Equity Method Investments [Line Items]
Ownership percentage				50.00%
Our total equity balance				$ 15.8
Percentage of profits received from joint venture				47.50%
Gain upon nonmonetary exchange	$ 6.0
payment to acquire investment	$ 5.2
Monashee's Separate Managed Accounts
Schedule of Equity Method Investments [Line Items]
Our total equity balance				$ 20.2

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