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Marketable Securities
3 Months Ended
Mar. 31, 2018
Investments Schedule [Abstract]  
Marketable Securities
MARKETABLE SECURITIES

Our marketable securities have maturities ranging from 1 month to 80 months, but our intent is to hold them for less than one year. They are classified as available for sale and carried at fair value in current assets on the consolidated balance sheets. Any unrealized gains and losses, net of tax, are included as a component of accumulated other comprehensive income.

The following table presents the values of our marketable securities as of the dates shown.
 
 
March 31, 2018
 
December 31, 2017
(in millions)
 
Amortized
Cost
 
Fair
Value
 
Amortized
Cost
 
Fair
Value
Zero coupon bonds
 
$
3.9

 
$
3.8

 
$
3.8

 
$
3.9

U.S. treasury and government agencies
 
6.0

 
5.9

 
6.0

 
6.0

Asset-backed securities
 
0.1

 
0.2

 
0.3

 
0.3

Corporate debt securities
 
9.1

 
9.1

 
9.1

 
9.2

State and political subdivisions
 
21.7

 
21.3

 
22.7

 
22.2

Total marketable securities
 
$
40.8

 
$
40.3

 
$
41.9

 
$
41.6



Gross realized and unrealized gains and losses on sales of marketable securities were not material for the three months ended March 31, 2018 and 2017.