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Investments in Marketable Securities (Tables)
 6 Months Ended
Jun. 30, 2019
Marketable Securities [Abstract]  
Schedule of Investments in Marketable Securities The following is a summary of the cost, gross unrealized gains, unrealized losses and fair value of Investments in marketable securities:
 
December 31,
2018
 
June 30,
2019
Cost
$
126.8

 
$
31.7

Unrealized gains
1.1

 
2.3

Unrealized losses
(8.6
)
 
(0.1
)
Fair value
$
119.3

 
$
33.9