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Investments in Marketable Securities | 12 Months Ended
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Dec. 31, 2022
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,
|  | 2021 |  | 2022
Cost |  | $ | 59.1 |  |  | $ | 394.4 |
Unrealized gains |  | 8.1 |  |  | 59.9 |
Unrealized losses |  | (2.7) |  |  | (6.4) |
Fair value |  | $ | 64.5 |  |  | $ | 447.9 |
As of December 31, 2022, investments in equity securities include ordinary shares of EQT AB (“EQT”), a public company listed on Nasdaq Stockholm (EQT.ST) (see Note 10), with a fair value of $405.1 million. Between January 1, 2023 and February 15, 2023, the Company has sold $196.0 million of EQT ordinary shares. As of December 31, 2021 and 2022, investments in equity securities include consolidated Affiliate sponsored investment products with fair values of $28.9 million and $23.5 million, respectively. For the year ended December 31, 2022, the Company recorded realized and unrealized gains on EQT ordinary shares of $43.8 million and $57.9 million, respectively. Debt Securities The following table summarizes the cost, gross unrealized losses, and fair value of investments in U.S. Treasury Notes classified as available-for-sale, of which $100.7 million mature in 2023 and $150.3 million mature in 2024, and other debt securities classified as trading:
|  | Available-for-Sale |  | Trading
|  | December 31, 2021 |  | December 31, 2022 |  | December 31, 2021 |  | December 31, 2022
Cost |  | $ | — |  |  | $ | 252.3 |  |  | $ | 14.1 |  |  | $ | 19.7 |
Unrealized losses |  | — |  |  | (1.3) |  |  | (0.1) |  |  | (1.7) |
Fair value |  | $ | — |  |  | $ | 251.0 |  |  | $ | 14.0 |  |  | $ | 18.0 |
As of December 31, 2021 and 2022, investments in debt securities classified as trading include consolidated Affiliate sponsored investment products with fair values of $14.0 million and $18.0 million, respectively.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI https://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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