Condensed Consolidated Statements of Changes in Equity - 6 months ended Nov. 30, 2015 - USD ($) $ in Millions	Common Stock	Capital Surplus	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Total
Balance at May. 31, 2015	$ 44.9	$ 442.6	$ 644.3	$ (246.3)	$ (40.4)	$ 845.1
Increase (Decrease) in Stockholders' Equity
Net income			30.9			30.9
Cash dividends			(5.2)			(5.2)
Stock option activity		1.2		1.8		3.0
Restricted stock activity	0.1	2.1		(4.7)		(2.5)
Repurchase of shares				(10.1)		(10.1)
Equity portion of bond repurchase		(0.2)				(0.2)
Other comprehensive income, net of tax					1.5	1.5
Balance at Nov. 30, 2015	$ 45.0	$ 445.7	$ 670.0	$ (259.3)	$ (38.9)	$ 862.5