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Investments in Marketable Securities
 6 Months Ended
Jun. 30, 2018
Marketable Securities [Abstract]  
Investments in Marketable Securities
Investments in Marketable Securities
As of December 31, 2017 and June 30, 2018, the fair value of marketable securities, which are principally equity securities, was $77.8 million and $84.1 million, respectively. Investments in marketable securities are reported within Investments and other assets. The following is a summary of the cost, gross unrealized gains and losses and fair value of investments in marketable securities:
 
December 31,
2017
 
June 30,
2018
Cost
$
67.1

 
$
73.9

Unrealized gains
13.0

 
12.5

Unrealized losses
(2.3
)
 
(2.3
)
Fair value
$
77.8

 
$
84.1


In the three and six months ended June 30, 2017, the Company received proceeds of $21.0 million and $58.3 million, respectively, from the sale of investments in marketable securities, and recorded net gains of $8.4 million and $15.1 million, respectively. In 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.