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Equity Securities - (Summary of Investments in Marketable Equity Securities) (Detail) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Equity securities, Cost | $ 413.1 | $ 445.1
Equity securities, Unrealized losses | (8.3) | (8.2)
Equity securities, Estimated fair value | 404.8 | 436.9
Common Stock |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Equity securities, Cost | 400.3 | 429.4
Equity securities, Unrealized losses | (8.1) | (4.9)
Equity securities, Estimated fair value | 392.2 | 424.5
Preferred Stock |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Equity securities, Cost | 12.8 | 15.7
Equity securities, Unrealized losses | (0.2) | (3.3)
Equity securities, Estimated fair value | $ 12.6 | $ 12.4

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