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Investments in Marketable Securities
 9 Months Ended
Sep. 30, 2015
Marketable Securities [Abstract]  
Investments in Marketable Securities
Investments in Marketable Securities
Investments in marketable securities at December 31, 2014 and September 30, 2015 were $172.6 million and $171.8 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 at December 31, 2014 and September 30, 2015:
 
Available-for-Sale
 
Trading
 
December 31,
2014
 
September 30,
2015
 
December 31,
2014
 
September 30,
2015
Cost
$
125.6

 
$
106.4

 
$
19.5

 
$
21.9

Unrealized Gains
42.8

 
47.0

 
2.9

 
1.9

Unrealized Losses
(18.1
)
 
(3.8
)
 
(0.1
)
 
(1.6
)
Fair Value
$
150.3

 
$
149.6

 
$
22.3

 
$
22.2


For each of the three and nine months ended September 30, 2014, there were $1.8 million of realized gains on investments classified as available-for-sale. In the three and nine months ended September 30, 2015, there were $0.7 million and $8.7 million of realized gains on investments classified as available-for-sale, 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 nine months ended September 30, 2014 and September 30, 2015.