Investments in Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2024

Investments, Debt and Equity 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	June 30, 2024
Cost	$35.3	$44.0
Unrealized gains	2.6	4.2
Unrealized losses	(0.0)	(0.2)
Fair value	$37.9	$48.0

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

U.S. Treasury securities classified as available-for-sale, all of which mature in 2024, and consolidated Affiliate sponsored

investment products classified as trading:

	Available-for-Sale		Trading
	December 31, 2023	June 30, 2024	December 31, 2023	June 30, 2024
Cost	$405.4	$99.9	$17.9	$19.7
Unrealized gains	0.0	—	—	—
Unrealized losses	(0.1)	(0.0)	(0.1)	(0.3)
Fair value	$405.3	$99.9	$17.8	$19.4