Basic and Diluted Earnings Per Share (Tables)

12 Months Ended

May 31, 2011

Basic and Diluted Earnings Per Share (Tables) [Abstract]

Basic and diluted earnings per share

	Year ended May 31,
In millions, except per share amounts	2011		2010		2009
Basic earnings per share:
Net income	$	515.3	$	477.0	$	533.5
Weighted-average common shares outstanding		361.8		361.4		360.8
Basic earnings per share	$	1.42	$	1.32	$	1.48
Diluted earnings per share:
Net income	$	515.3	$	477.0	$	533.5
Weighted-average common shares outstanding		361.8		361.4		360.8
Dilutive effect of common share equivalents at average market price		0.6		0.3		0.2
Weighted-average common shares outstanding, assuming dilution		362.4		361.7		361.0
Diluted earnings per share	$	1.42	$	1.32	$	1.48
Weighted-average anti-dilutive common share equivalents		11.5		13.0		13.5