XML 61 R38.htm IDEA: XBRL DOCUMENT v3.8.0.1
Investments in Marketable Securities (Tables)
12 Months Ended
Dec. 31, 2017
Marketable Securities [Abstract]  
Schedule of Cost, Gross Unrealized Gains and Losses, and Fair Value of Investments
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
 
December 31, 2017
 
December 31, 2016
 
December 31, 2017
Cost
 
$
66.1

 
$
18.3

 
$
34.4

 
$
48.8

Unrealized Gains
 
17.6

 
2.7

 
6.6

 
10.3

Unrealized Losses
 
(1.8
)
 
(0.4
)
 
(0.5
)
 
(1.9
)
Fair Value
 
$
81.9

 
$
20.6

 
$
40.5

 
$
57.2