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Investments in Marketable Securities | 3 Months Ended
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Mar. 31, 2019
Marketable Securities [Abstract] |
Investments in Marketable Securities | Investments in Marketable Securities The following is a summary of the cost, gross unrealized gains, and losses and fair value of Investments in marketable securities:
| December 31, 2018 |  | March 31, 2019
Cost | $ | 126.8 |  |  | $ | 35.0 |
Unrealized gains | 1.1 |  |  | 1.6 |
Unrealized losses | (8.6 | ) |  | (0.2 | )
Fair value | $ | 119.3 |  |  | $ | 36.4 |
For the three months ended March 31, 2018 and 2019, the Company received proceeds of $13.8 million and $15.1 million, respectively, from the sale of investments in marketable securities, and recorded net gains of $2.8 million and $0.5 million, respectively. For the three months ended March 31, 2019, the Company deconsolidated an Affiliate sponsored investment product with a fair value of $84.3 million.

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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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