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Earnings (Loss) Per Share (Tables) | 12 Months Ended
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Dec. 31, 2013
Basic and Diluted 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 | 2013 | 2012 | 2011
Net income (loss) attributable to Pentair Ltd. | $ | 536.8 |  | $ | (107.2 | ) | $ | (7.5 | )
Weighted average common shares outstanding |  |  |
Basic | 201.1 |  | 127.4 |  | 98.2 |
Dilutive impact of stock options and restricted stock awards | 3.5 |  | — |  | — |
Diluted | 204.6 |  | 127.4 |  | 98.2 |
Earnings (loss) per common share attributable to Pentair Ltd. |  |  |
Basic earnings (loss) per common share | $ | 2.67 |  | $ | (0.84 | ) | $ | (0.08 | )
Diluted earnings (loss) per common share | $ | 2.62 |  | $ | (0.84 | ) | $ | (0.08 | )
Anti-dilutive stock options excluded from the calculation of diluted earnings per share | 0.2 |  | 16.0 |  | 8.4 |

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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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