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Equity Securities - (Summary of Investments in Marketable Equity Securities) (Detail) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Equity securities, Cost | $ 416.2 | $ 445.1
Equity securities, Unrealized losses | (26.3) | (8.2)
Equity securities, Estimated fair value | 389.9 | 436.9
Common Stock |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Equity securities, Cost | 402.4 | 429.4
Equity securities, Unrealized losses | (25.7) | (4.9)
Equity securities, Estimated fair value | 376.7 | 424.5
Preferred Stock |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Equity securities, Cost | 13.8 | 15.7
Equity securities, Unrealized losses | (0.6) | (3.3)
Equity securities, Estimated fair value | $ 13.2 | $ 12.4

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