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Investments in Marketable Securities
 6 Months Ended
Jun. 30, 2016
Marketable Securities [Abstract]  
Investments in Marketable Securities
Investments in Marketable Securities
Investments in marketable securities at December 31, 2015 and June 30, 2016 were $199.9 million and $203.6 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
 
June 30,
2016
 
December 31,
2015
 
June 30,
2016
Cost
$
104.7

 
$
73.1

 
$
19.8

 
$
96.8

Unrealized Gains
77.6

 
36.0

 
1.9

 
5.2

Unrealized Losses
(1.8
)
 
(1.5
)
 
(2.3
)
 
(6.0
)
Fair Value
$
180.5

 
$
107.6

 
$
19.4

 
$
96.0


In the six months ended June 30, 2015, the Company realized gains on investments classified as available-for-sale of $7.9 million, all of which occurred in the three months ended June 30, 2015. In the three and six months ended June 30, 2016, the Company realized gains on investments classified as available-for-sale of $7.5 million and $9.2 million, respectively. These gains were recorded in Investment and other income. There were no significant realized gains or losses on investments classified as trading in the three and six months ended June 30, 2015 and 2016.