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Earnings Per Share (Tables)
 9 Months Ended
Sep. 28, 2013
Basic and Diluted Earnings Per Share
Basic and diluted earnings per share were calculated as follows:
 
Three months ended    
 
Nine months ended
In millions, except per-share data
September 28,
2013
September 29,
2012
 
September 28,
2013
September 29,
2012
Net income attributable to Pentair Ltd.
$
172.8

$
31.4

 
$
378.6

$
165.9

Weighted average common shares outstanding
 
 
 
 
 
Basic
199.3

100.4

 
202.1

99.5

Dilutive impact of stock options and restricted stock units
3.5

2.5

 
3.5

2.2

Diluted
202.8

102.9

 
205.6

101.7

Earnings per common share attributable to Pentair Ltd.
 
 
 
 
 
Basic earnings per common share
$
0.87

$
0.31

 
$
1.87

$
1.67

Diluted earnings per common share
$
0.85

$
0.31

 
$
1.84

$
1.63

Anti-dilutive stock options excluded from the calculation of diluted earnings per share
0.1

0.3

 
0.9

1.4