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Investments in Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 2016
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:
 
Available-for-Sale
 
Trading
 
December 31,
2015
 
March 31,
2016
 
December 31,
2015
 
March 31,
2016
Cost
$
104.7

 
$
94.0

 
$
19.8

 
$
57.7

Unrealized Gains
77.6

 
59.2

 
1.9

 
4.1

Unrealized Losses
(1.8
)
 
(1.5
)
 
(2.3
)
 
(5.3
)
Fair Value
$
180.5

 
$
151.7

 
$
19.4

 
$
56.5