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Investments in Marketable Securities
 9 Months Ended
Sep. 30, 2018
Marketable Securities [Abstract]  
Investments in Marketable Securities
Investments in Marketable Securities
Investments in marketable securities at December 31, 2017 and September 30, 2018 were $77.8 million and $144.1 million, respectively. The following is a summary of the cost, gross unrealized gains and losses and fair value of Investments in marketable securities:
 
December 31,
2017
 
September 30,
2018
Cost
$
67.1

 
$
128.3

Unrealized gains
13.0

 
15.8

Unrealized losses
(2.3
)
 
(0.0
)
Fair value
$
77.8

 
$
144.1


In the three and nine months ended September 30, 2017, the Company received proceeds of $23.6 million and $81.9 million, respectively, from the sale of investments in marketable securities, and recorded net gains of $9.1 million and $24.2 million, respectively. In the three and nine months ended September 30, 2018, the Company received proceeds of $16.6 million and $42.6 million, respectively, from the sale of investments in marketable securities, and recorded net losses of $0.0 million and net gains of $4.0 million, respectively.