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Investments in Marketable Securities (Tables)
 3 Months Ended
Mar. 31, 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
 
March 31,
2018
Cost
$
67.1

 
$
74.2

Unrealized gains
13.0

 
9.0

Unrealized losses
(2.3
)
 
(2.2
)
Fair value
$
77.8

 
$
81.0