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Equity Securities - (Summary of Investments in Equity Securities, by Classification) (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]
Marketable equity securities	$ 404.8	$ 436.9
Non-marketable equity securities	219.1	224.1
Equity method investments	101.1	74.6
Equity Securities	$ 725.0	$ 735.6

X

- Definition

The total of marketable equity securities, non-marketable equity securities and equity method investments.

+ References

No definition available.

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- Definition

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.

+ References

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- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
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- Definition

Amount of investment in equity security without readily determinable fair value.

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