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Investments in Marketable Securities
 9 Months Ended
Sep. 30, 2014
Marketable Securities [Abstract]  
Investments in Marketable Securities
Investments in Marketable Securities
Investments in marketable securities at December 31, 2013 and September 30, 2014 were $157.9 million and $158.1 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, 2013 and September 30, 2014:
 
Available-for-Sale
 
Trading
 
December 31,
2013
 
September 30,
2014
 
December 31,
2013
 
September 30,
2014
Cost
$
103.2

 
$
114.7

 
$
17.9

 
$
18.5

Unrealized Gains
33.3

 
28.0

 
4.6

 
3.6

Unrealized Losses
(1.1
)
 
(6.7
)
 
(0.0
)
 
(0.0
)
Fair Value
$
135.4

 
$
136.0

 
$
22.5

 
$
22.1


There were no realized gains or losses on investments classified as available-for-sale for the three months ended September 30, 2013 and $2.1 million of realized gains for the nine months ended September 30, 2013. For each of the three and nine months ended September 30, 2014, there was $1.8 million of realized gains on investments classified as available-for-sale.