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Investments in Marketable Securities
 9 Months Ended
Sep. 30, 2016
Marketable Securities [Abstract]  
Investments in Marketable Securities
Investments in Marketable Securities
Investments in marketable securities at December 31, 2015 and September 30, 2016 were $199.9 million and $213.2 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
 
September 30,
2016
 
December 31,
2015
 
September 30,
2016
Cost
$
104.7

 
$
66.5

 
$
19.8

 
$
97.9

Unrealized gains
77.6

 
40.5

 
1.9

 
11.5

Unrealized losses
(1.8
)
 
(0.5
)
 
(2.3
)
 
(2.7
)
Fair Value
$
180.5

 
$
106.5

 
$
19.4

 
$
106.7


In the three and nine months ended September 30, 2015, the Company realized gains on investments classified as available-for-sale of $0.7 million and $8.7 million, respectively. In the three and nine months ended September 30, 2016, the Company realized gains on investments classified as available-for-sale of $6.2 million and $15.4 million, respectively. These gains were recorded in Investment and other (income) expense. There were no significant realized gains or losses on investments classified as trading in the three and nine months ended September 30, 2015 and 2016.