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Investments in Marketable Securities
 3 Months Ended
Mar. 31, 2024
Marketable Securities [Abstract]  
Investments in Marketable Securities Investments in Marketable Securities
Equity 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
As of December 31, 2023 and March 31, 2024, investments in equity securities include consolidated Affiliate sponsored
investment products with fair values of $15.8 million and $7.7 million, respectively.
For the three months ended March 31, 2023 and 2024, the Company recognized net unrealized gains on equity securities
still held as of March 31, 2023 and 2024 of $1.4 million.
Debt Securities
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
For the three months ended March 31, 2023 and 2024, the Company received $101.7 million and $425.2 million of
proceeds from the maturity of available-for-sale securities, respectively.