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Investments in Marketable Securities (Tables)
 9 Months Ended
Sep. 30, 2017
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,
2016
 
September 30,
2017
 
December 31,
2016
 
September 30,
2017
Cost
$
66.1

 
$
30.5

 
$
34.4

 
$
44.2

Unrealized gains
17.6

 
10.8

 
6.6

 
8.5

Unrealized losses
(1.8
)
 
—

 
(0.5
)
 
(1.6
)
Fair Value
$
81.9

 
$
41.3

 
$
40.5

 
$
51.1