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Investments in Marketable Securities
 12 Months Ended
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.