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Equity Securities - (Summary of Investments in Equity Securities, by Classification) (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Marketable equity securities	$ 386.8	$ 436.9
Non-marketable equity securities	202.4	224.1
Equity method investments	102.1	74.6
Equity Securities	$ 691.3	$ 735.6

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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