Earnings per Share

6 Months Ended

Oct. 31, 2013

Earnings Per Share [Abstract]

Earnings per Share

Note 8: Earnings per Share

The following table sets forth the computation of net income per common share and net income per common share – assuming dilution under the two-class method.

	Three Months Ended October 31,				Six Months Ended October 31,
	2013		2012		2013		2012
Net income	$	153.4	$	148.8	$	280.0	$	259.7
Net income allocated to participating securities		1.2		1.2		2.3		2.2
Net income allocated to common stockholders	$	152.2	$	147.6	$	277.7	$	257.5
Weighted-average common shares outstanding		104,311,146		108,269,499		104,694,335		108,844,046
Dilutive effect of stock options		15,251		26,600		16,003		28,068
Weighted-average common shares outstanding—assuming dilution		104,326,397		108,296,099		104,710,338		108,872,114
Net income per common share	$	1.46	$	1.36	$	2.65	$	2.37
Net income per common share—assuming dilution	$	1.46	$	1.36	$	2.65	$	2.36