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Investments (Tables)
 9 Months Ended
Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Investments
The Company’s investments subject to fair value measurement consist of the following:
 
 
Cost Basis
 
Unrealized
Gain / (Loss)
 
Fair Value
As of September 30, 2019
 
 
 
 
 
 
Short-term investments
 
 
 
 
 
 
Certificates of deposit
 
$
8.2

 
$
—

 
$
8.2

Long-term investments
 
 
 
 
 
 
Assets held in a rabbi trust
 
$
5.2

 
$
0.6

 
$
5.8

 
 
 
 
 
 
 
As of December 31, 2018
 
 
 
 
 
 
Short-term investments
 
 
 
 
 
 
Certificates of deposit
 
$
33.5

 
$
—

 
$
33.5

Long-term investments
 
 
 
 
 
 
Assets held in a rabbi trust
 
$
6.5

 
$
(0.2
)
 
$
6.3