Financial Instruments (Tables)

12 Months Ended

May. 31, 2015

Fair Value Disclosures [Abstract]

Available-For-Sale Securities At Market Value

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

Scheduled Maturities Of Available-For-Sale Securities

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