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Investments in Marketable Securities | 3 Months Ended
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Mar. 31, 2021
Marketable Securities [Abstract] |
Investments in Marketable Securities | Investments in Marketable Securities The following table summarizes the cost, gross unrealized gains, gross unrealized losses, and fair value of Investments in marketable securities:
|  |  |  |  | December 31, 2020 |  | March 31, 2021
Cost |  |  |  |  | $ | 69.4 |  |  | $ | 102.9 |
Unrealized gains |  |  |  |  | 5.5 |  |  | 6.3 |
Unrealized losses |  |  |  |  | (0.0 | ) |  | (0.4) |
Fair value |  |  |  |  | $ | 74.9 |  |  | $ | 108.8 |
As of December 31, 2020 and March 31, 2021, Investments in marketable securities include consolidated Affiliate sponsored investment products with fair values of $52.3 million and $77.8 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 http://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 http://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 http://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 http://asc.fasb.org/subtopic&trid=2176304 + Details
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