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Investments in Marketable Securities | 12 Months Ended
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Dec. 31, 2019
Marketable Securities [Abstract] |
Investments in Marketable Securities | Investments in Marketable Securities The following is a summary of the cost, gross unrealized gains, unrealized losses and fair value of Investments in marketable securities:
|  | December 31,
|  | 2018 |  | 2019
Cost |  | $ | 126.8 |  |  | $ | 57.9 |
Unrealized gains |  | 1.1 |  |  | 2.1 |
Unrealized losses |  | (8.6 | ) |  | (0.6 | )
Fair value |  | $ | 119.3 |  |  | $ | 59.4 |
For the years ended December 31, 2018 and 2019, the Company received proceeds of $81.4 million and $38.0 million, respectively, from the sale of investments in marketable securities and recorded net gains of $6.9 million and $1.1 million, respectively. As of December 31, 2018 and 2019, Investments in marketable securities includes consolidated Affiliate sponsored investment products with fair values of $105.1 million and $38.1 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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