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Financial Instruments
 12 Months Ended
May. 31, 2015
Fair Value Disclosures [Abstract]  
Financial Instruments
FINANCIAL INSTRUMENTS
Marketable securities are carried at fair value and consist of available-for-sale securities related to insurance funding requirements for our workers' compensation and general liability claims. The following table summarizes cost and market value for our securities that qualify as available-for-sale as of May 31, 2015:
(in millions)
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Market Value
Available-for-sale securities
$
8.8

 
$
—

 
$
—

 
$
8.8



Earnings include insignificant realized gains and loss from sales of available-for-sale securities. At May 31, 2015, the scheduled maturities of our available-for-sale securities are as follows:
(in millions)
Cost
 
Market Value
Less than 1 year
$
1.7

 
$
1.7

1 to 3 years
6.4

 
6.4

3 to 5 years
0.7

 
0.7

Total
$
8.8

 
$
8.8