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Investments in Marketable Securities (Tables)
 6 Months Ended
Jun. 30, 2018
Marketable Securities [Abstract]  
Schedule of Investments in Marketable Securities
The following is a summary of the cost, gross unrealized gains and losses and fair value of investments in marketable securities:
 
December 31,
2017
 
June 30,
2018
Cost
$
67.1

 
$
73.9

Unrealized gains
13.0

 
12.5

Unrealized losses
(2.3
)
 
(2.3
)
Fair value
$
77.8

 
$
84.1