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Investments in Marketable Securities
 12 Months Ended
Dec. 31, 2016
Marketable Securities [Abstract]  
Investments in Marketable Securities
Investments in Marketable Securities
Investments in marketable securities at December 31, 2015 and 2016 were $199.9 million and $122.4 million, respectively. The following is a summary of the cost, gross unrealized gains and losses and fair value of investments classified as available-for-sale and trading:
 
 
Available-for-Sale
 
Trading
 
 
December 31, 2015
 
December 31, 2016
 
December 31, 2015
 
December 31, 2016

Cost
 
$
104.7

 
$
66.1

 
$
19.8

 
$
34.4

Unrealized Gains
 
77.6

 
17.6

 
1.9

 
6.6

Unrealized Losses
 
(1.8
)
 
(1.8
)
 
(2.3
)
 
(0.5
)
Fair Value
 
$
180.5

 
$
81.9

 
$
19.4

 
$
40.5

For the years ended December 31, 2015 and 2016, the Company received proceeds of $18.1 million and $61.1 million, respectively, from the sale of investments classified as available-for-sale and recorded gains of $8.8 million and $19.9 million, respectively. For the years ended December 31, 2015 and 2016, the Company realized gains on the sale of investments classified as trading of $0.8 million and $4.4 million, respectively. For the years ended December 31, 2015 and 2016, the Company realized losses on the sale of investments classified as trading of $0.1 million and $3.4 million, respectively. These gains and losses were recorded in Investment and other income.