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Investments (Tables)
6 Months Ended
Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Investments
The Company’s investments subject to fair value measurement consist of the following:
 
 
Cost Basis
 
Unrealized Gain
 
Fair Value
As of June 30, 2018
 
 
 
 
 
 
Short-term investments
 
 
 
 
 
 
Certificates of deposit
 
$
14.5

 
$

 
$
14.5

Long-term investments
 
 
 
 
 
 
Assets held in a rabbi trust
 
$
6.7

 
$
0.8

 
$
7.5

 
 
 
 
 
 
 
As of December 31, 2017
 
 
 
 
 
 
Short-term investments
 
 
 
 
 
 
Certificates of deposit
 
$
81.4

 
$

 
$
81.4

Long-term investments
 
 
 
 
 
 
Assets held in a rabbi trust
 
$
8.3

 
$
1.1

 
$
9.4