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Equity Securities - (Summary of Changes in Carrying Amounts of Non Marketable Equity Securities) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Equity Securities Without Readily Determinable Fair Value [Line Items] |  |  |  |
Carrying amount, beginning of period |  |  | $ 224.1 |
Carrying amount, end of period | $ 225.8 |  | 225.8 |
Non Marketable Equity Securities |  |  |  |
Equity Securities Without Readily Determinable Fair Value [Line Items] |  |  |  |
Carrying amount, beginning of period | 226.1 | $ 384.7 | 224.1 | $ 395.8
Net additions | 1.3 | 0.8 | 3.1 | 6.8
Gross unrealized gains | 1.2 | 0.0 | 1.4 | 0.0
Gross unrealized losses and impairments | (2.8) | (22.6) | (2.8) | (39.7)
Carrying amount, end of period | $ 225.8 | $ 362.9 | $ 225.8 | $ 362.9

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