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Investments in Marketable Securities
 6 Months Ended
Jun. 30, 2014
Marketable Securities [Abstract]  
Investments in Marketable Securities
Investments in Marketable Securities
Investments in marketable securities at December 31, 2013 and June 30, 2014 were $157.9 million and $149.0 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 June 30, 2014:
 
Available-for-Sale
 
Trading
 
December 31,
2013
 
June 30,
2014
 
December 31,
2013
 
June 30,
2014
Cost
$
103.2

 
$
106.8

 
$
17.9

 
$
15.5

Unrealized Gains
33.3

 
20.4

 
4.6

 
8.1

Unrealized Losses
(1.1
)
 
(1.8
)
 
(0.0
)
 
—

Fair Value
$
135.4

 
$
125.4

 
$
22.5

 
$
23.6


The Company had no significant realized gains and losses on investments for the periods presented.