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Equity Securities - (Summary of Changes in Carrying Amounts of Non Marketable Equity Securities) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Equity Securities Without Readily Determinable Fair Value [Line Items] |  |  |  |
Carrying amount, beginning of period |  |  | $ 224.1 |
Carrying amount, end of period | $ 219.1 |  | 219.1 |
Non Marketable Equity Securities |  |  |  |
Equity Securities Without Readily Determinable Fair Value [Line Items] |  |  |  |
Carrying amount, beginning of period | 225.8 | $ 362.9 | 224.1 | $ 395.8
Net additions (disposals) | 2.4 | (6.0) | 5.5 | 0.8
Gross unrealized gains | 0.1 | 0.0 | 1.5 | 0.0
Gross unrealized losses and impairments | (9.2) | (130.2) | (12.0) | (169.9)
Carrying amount, end of period | $ 219.1 | $ 226.7 | $ 219.1 | $ 226.7

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