Three Months Ended

October 31,

Six Months Ended

October 31,

(Dollars in millions, except per share amounts)

2010

2011

2010

2011

Net income

$

154.0

$

157.6

$

265.4

$

275.6

Income allocated to participating securities (restricted shares)

(0.2

)

(0.1

)

(0.3

)

(0.1

)

Net income available to common stockholders

$

153.8

$

157.5

$

265.1

$

275.5

Share data (in thousands):

Basic average common shares outstanding

145,649

143,209

146,113

143,912

Dilutive effect of stock options, SSARs, RSUs, and DSUs

855

975

835

1,007

Diluted average common shares outstanding

146,504

144,184

146,948

144,919

Basic earnings per share

$

1.06

$

1.10

$

1.81

$

1.91

Diluted earnings per share

$

1.05

$

1.09

$

1.80

$

1.90