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Other Assets - Additional Information (Detail) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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iCapital [Member] |  |
Other Assets [Line Items] |  |
Carrying value - equity method investment | $ 711.0 | $ 652.0
Percentage of strategic minority investment | 22.00% | 24.00%
Other Assets [Member] |  |
Other Assets [Line Items] |  |
Carrying value - equity method investment | $ 1.6 | $ 888.0
Other non equity method corporate minority investments | $ 780.0 | $ 438.0

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