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Investments in Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2024

Marketable Securities [Abstract]

Schedule of Investments in Marketable Securities

The following table summarizes the cost, gross unrealized gains, gross unrealized losses, and fair value of investments in

equity securities:

		December 31, 2023		March 31, 2024
Cost		$35.3		$30.6
Unrealized gains		2.6		3.6
Unrealized losses		(0.0)		(0.1)
Fair value		$37.9		$34.1

The following table summarizes the cost, unrealized gains, unrealized losses, and fair value of investments in U.S. Treasury

securities classified as available-for-sale, all of which matures in 2024, and consolidated Affiliate sponsored investment

products classified as trading:

		Available-for-sale				Trading
		December 31, 2023		March 31, 2024		December 31, 2023		March 31, 2024
Cost		$405.4		$296.5		$17.9		$18.5
Unrealized gains		0.0		0.0		—		—
Unrealized losses		(0.1)		—		(0.1)		(0.2)
Fair value		$405.3		$296.5		$17.8		$18.3

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- Definition

Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets.

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