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Investments in Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2015:
 
Available-for-Sale
 
Trading
 
December 31,
2014
 
March 31,
2015
 
December 31,
2014
 
March 31,
2015
Cost
$
125.6

 
$
123.1

 
$
19.5

 
$
21.9

Unrealized Gains
42.8

 
49.8

 
2.9

 
3.5

Unrealized Losses
(18.1
)
 
(5.0
)
 
(0.1
)
 
(0.4
)
Fair Value
$
150.3

 
$
167.9

 
$
22.3

 
$
25.0