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Earnings (Loss) Per Share (Tables) | 12 Months Ended
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Dec. 31, 2012
Basic and Diluted 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.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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