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Derivative Financial Instruments - External Credit Ratings of Underlyings or Referenced Assets (Details) - Index credit default swaps - USD ($) $ in Millions | Aug. 31, 2025 | Nov. 30, 2024
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Derivative [Line Items] |  |
Notional amount | $ 395.2 | $ 948.6
Investment Grade |  |
Derivative [Line Items] |  |
Notional amount | 31.1 | 395.2
Non-investment Grade |  |
Derivative [Line Items] |  |
Notional amount | $ 364.1 | $ 553.4

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