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Equity Securities - (Summary of Changes in Carrying Amount of Non Marketable Equity Securities) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Equity Securities Without Readily Determinable Fair Value [Line Items] |  |
Carrying amount, beginning of period | $ 395.8 |
Carrying amount, end of period | 224.1 | $ 395.8
Non Marketable Equity Securities |  |
Equity Securities Without Readily Determinable Fair Value [Line Items] |  |
Carrying amount, beginning of period | 395.8 | 441.3
Net (sales) additions | (4.0) | 91.8
Gross unrealized gains | 1.5 | 16.1
Gross unrealized losses and impairments | (169.2) | (153.4)
Carrying amount, end of period | $ 224.1 | $ 395.8

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