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Equity Securities - (Summary of Investments in Marketable Equity Securities) (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Equity securities, Cost | $ 445.1 | $ 339.0
Equity securities, Unrealized losses | (8.2) | (59.5)
Equity securities, Estimated fair value | 436.9 | 279.5
Common Stock |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Equity securities, Cost | 429.4 | 323.7
Equity securities, Unrealized losses | (4.9) | (55.6)
Equity securities, Estimated fair value | 424.5 | 268.1
Preferred Stock |  |
Schedule Of Trading Securities And Other Trading Assets [Line Items] |  |
Equity securities, Cost | 15.7 | 15.3
Equity securities, Unrealized losses | (3.3) | (3.9)
Equity securities, Estimated fair value | $ 12.4 | $ 11.4

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