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Investments in Marketable Securities (Tables)
 6 Months Ended
Jun. 30, 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
 
June 30,
2016
 
December 31,
2015
 
June 30,
2016
Cost
$
104.7

 
$
73.1

 
$
19.8

 
$
96.8

Unrealized Gains
77.6

 
36.0

 
1.9

 
5.2

Unrealized Losses
(1.8
)
 
(1.5
)
 
(2.3
)
 
(6.0
)
Fair Value
$
180.5

 
$
107.6

 
$
19.4

 
$
96.0