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Investments in Marketable Securities (Tables)
 6 Months Ended
Jun. 30, 2015
Marketable Securities [Abstract]  
Schedule of Available-For-Sale and Trading Securities
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 June 30, 2015:
 
Available-for-Sale
 
Trading
 
December 31,
2014
 
June 30,
2015
 
December 31,
2014
 
June 30,
2015
Cost
$
125.6

 
$
113.3

 
$
19.5

 
$
20.1

Unrealized Gains
42.8

 
126.4

 
2.9

 
4.4

Unrealized Losses
(18.1
)
 
(2.6
)
 
(0.1
)
 
(0.1
)
Fair Value
$
150.3

 
$
237.1

 
$
22.3

 
$
24.4