Three Months Ended
January 31,

Nine Months Ended
January 31,

(Dollars in millions, except per share amounts)

2011

2012

2011

2012

Net income

$

140.7

$

133.1

$

406.1

$

408.7

Income allocated to participating securities (restricted shares)

(0.1

)

—

(0.4

)

(0.1

)

Net income available to common stockholders

$

140.6

$

133.1

$

405.7

$

408.6

Share data (in thousands):

Basic average common shares outstanding

145,061

141,928

145,787

143,317

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

979

1,072

883

1,029

Diluted average common shares outstanding

146,040

143,000

146,670

144,346

Basic earnings per share

$

0.97

$

0.94

$

2.78

$

2.85

Diluted earnings per share

$

0.96

$

0.93

$

2.77

$

2.83