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Investments in Marketable Securities
 6 Months Ended
Jun. 30, 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
 
June 30,
2019
Cost
$
126.8

 
$
31.7

Unrealized gains
1.1

 
2.3

Unrealized losses
(8.6
)
 
(0.1
)
Fair value
$
119.3

 
$
33.9


For the three and six months ended June 30, 2018, the Company received proceeds of $12.1 million and $25.9 million, respectively, from the sale of investments in marketable securities, and recorded net gains of $1.3 million and $4.1 million, respectively. For the three and six months ended June 30, 2019, the Company received proceeds of $3.4 million and $18.5 million, respectively, from the sale of investments in marketable securities, and recorded net gains of $0.2 million and $0.7 million, respectively.
In the first quarter of 2019, the Company deconsolidated an Affiliate sponsored investment product with a fair value of $84.3 million.