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Investments in Marketable Securities
 12 Months Ended
Dec. 31, 2014
Marketable Securities [Abstract]  
Investments in Marketable Securities
Investments in Marketable Securities
Investments in marketable securities at December 31, 2013 and 2014 were $157.9 million and $172.6 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 at December 31, 2013 and 2014:
 
Available-for-Sale
 
Trading
 
December 31, 2013
 
December 31, 2014
 
December 31, 2013
 
December 31, 2014

Cost
$
103.2

 
$
125.6

 
$
17.9

 
$
19.5

Unrealized Gains
33.3

 
42.8

 
4.6

 
2.9

Unrealized Losses
(1.1
)
 
(18.1
)
 
(0.0
)
 
(0.1
)
Fair Value
$
135.4

 
$
150.3

 
$
22.5

 
$
22.3

There were no significant realized gains or losses on investments classified as available-for-sale for the year ended December 31, 2013. For the year ended December 31, 2014, there were $3.4 million of realized gains on investments classified as available-for-sale.