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Investments in Marketable Securities
 3 Months Ended
Mar. 31, 2018
Marketable Securities [Abstract]  
Investments in Marketable Securities
Investments in Marketable Securities
As of December 31, 2017 and March 31, 2018, the fair value of marketable securities was $77.8 million and $81.0 million, respectively, and marketable securities were principally investments in equity securities. 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
 
March 31,
2018
Cost
$
67.1

 
$
74.2

Unrealized gains
13.0

 
9.0

Unrealized losses
(2.3
)
 
(2.2
)
Fair value
$
77.8

 
$
81.0


In the three months ended March 31, 2017 and 2018, the Company received proceeds of $37.3 million and $13.8 million, respectively, from the sale of investments in marketable securities and recorded net gains of $6.7 million and $2.8 million, respectively.