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Investments in Marketable Securities | 3 Months Ended
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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.

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