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Investments in Marketable Securities (Tables) | 9 Months Ended
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Sep. 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 |  | September 30, 2024
Cost | $35.3 |  | $37.6
Unrealized gains | 2.6 |  | 4.7
Unrealized losses | (0.0) |  | (0.3)
Fair value | $37.9 |  | $42.0
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 matured during the nine months ended September 30, 2024, and consolidated Affiliate sponsored investment products classified as trading:
| Available-for-Sale |  | Trading
| December 31, 2023 |  | September 30, 2024 |  | December 31, 2023 |  | September 30, 2024
Cost | $405.4 |  | $— |  | $17.9 |  | $23.3
Unrealized gains | 0.0 |  | — |  | — |  | 0.8
Unrealized losses | (0.1) |  | — |  | (0.1) |  | —
Fair value | $405.3 |  | $— |  | $17.8 |  | $24.1

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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. + References No definition available. + Details
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