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Investments (Tables)
6 Months Ended
Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Investments
The Company’s investments, respectively, consist of the following:
 
 
Cost Basis
 
Unrealized Gain
 
Fair Value
As of June 30, 2017
 
 
 
 
 
 
Short-term investments
 
 
 
 
 
 
Certificates of deposit
 
$
76.9

 
$

 
$
76.9

Long-term investments
 
 
 
 
 
 
Assets held in a rabbi trust
 
$
7.8

 
$
1.1

 
$
8.9

 
 
 
 
 
 
 
As of December 31, 2016
 
 
 
 
 
 
Short-term investments
 
 
 
 
 
 
Certificates of deposit
 
$
64.1

 
$

 
$
64.1

Long-term investments
 
 
 
 
 
 
Assets held in a rabbi trust
 
$
7.9

 
$
0.6

 
$
8.5