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Earnings (Loss) Per Share
 12 Months Ended
Dec. 31, 2015
Earnings (Loss) Per Share
Earnings (Loss) Per Share
Basic and diluted earnings (loss) per share were calculated as follows:
 
Years ended December 31
In millions, except per share data
2015
2014
2013
Net income (loss) attributable to Pentair plc
$
(76.4
)
$
214.9

$
536.8

Net income (loss) from continuing operations attributable to Pentair plc
$
(65.0
)
$
607.0

$
511.7

Weighted average ordinary shares outstanding
 
 
 
Basic
180.3

190.6

201.1

Dilutive impact of stock options and restricted stock awards
2.3

3.1

3.5

Diluted
182.6

193.7

204.6

Earnings (loss) per ordinary share attributable to Pentair plc
 
 
 
Basic
 
 
 
Continuing operations
$
(0.36
)
$
3.19

$
2.54

Discontinued operations
(0.06
)
(2.06
)
0.13

Basic earnings (loss) per ordinary share attributable to Pentair plc
$
(0.42
)
$
1.13

$
2.67

Diluted
 
 
 
Continuing operations
$
(0.36
)
$
3.14

$
2.50

Discontinued operations
(0.06
)
(2.03
)
0.12

Diluted earnings (loss) per ordinary share attributable to Pentair plc
$
(0.42
)
$
1.11

$
2.62

Anti-dilutive stock options excluded from the calculation of diluted earnings per share
1.3

0.5

0.2