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Earnings (Loss) Per Share
 12 Months Ended
Dec. 31, 2012
Earnings (Loss) Per Share
Earnings (Loss) Per Share
Basic and diluted earnings (loss) per share were calculated as follows:
 
Years ended December 31
In thousands, except per share data
2012
2011
2010
Net income (loss) attributable to Pentair Ltd.
$
(107,186
)
$
(7,450
)
$
184,913

Net income (loss) from continuing operations attributable to Pentair Ltd.
$
(107,186
)
$
(7,450
)
$
185,539

Weighted average common shares outstanding
 
 
 
Basic
127,368

98,233

98,037

Dilutive impact of stock options and restricted stock awards (1)
—

—

1,257

Diluted
127,368

98,233

99,294

Earnings (loss) per common share attributable to Pentair Ltd.
 
 
 
Basic
 
 
 
Continuing operations
$
(0.84
)
$
(0.08
)
$
1.89

Discontinued operations
—

—

(0.01
)
Basic earnings (loss) per common share
$
(0.84
)
$
(0.08
)
$
1.88

Diluted
 
 
 
Continuing operations
$
(0.84
)
$
(0.08
)
$
1.87

Discontinued operations
—

—

(0.01
)
Diluted earnings (loss) per common share
$
(0.84
)
$
(0.08
)
$
1.86

Anti-dilutive stock options and restricted stock awards (2)
16,007

8,357

3,711

 
(1)
The incremental share impact from stock options and restricted stock awards was computed using the treasury stock method.

(2)
Stock options and restricted stock awards that were not dilutive were excluded from our calculation of diluted weighted average shares.