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Earnings (Loss) Per Share (Tables) | 12 Months Ended
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Dec. 31, 2014
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 | 2014 | 2013 | 2012
Net income (loss) attributable to Pentair plc | $ | 214.9 |  | $ | 536.8 |  | $ | (107.2 | )
Net income (loss) from continuing operations attributable to Pentair plc | $ | 607.0 |  | $ | 511.7 |  | $ | (81.5 | )
Weighted average ordinary shares outstanding |  |  |
Basic | 190.6 |  | 201.1 |  | 127.4 |
Dilutive impact of stock options and restricted stock awards | 3.1 |  | 3.5 |  | — |
Diluted | 193.7 |  | 204.6 |  | 127.4 |
Earnings (loss) per ordinary share attributable to Pentair plc |  |  |
Basic |  |  |
Continuing operations | $ | 3.19 |  | $ | 2.54 |  | $ | (0.64 | )
Discontinued operations | (2.06 | ) | 0.13 |  | (0.20 | )
Basic earnings (loss) per ordinary share attributable to Pentair plc | $ | 1.13 |  | $ | 2.67 |  | $ | (0.84 | )
Diluted |  |  |
Continuing operations | $ | 3.14 |  | $ | 2.50 |  | $ | (0.64 | )
Discontinued operations | (2.03 | ) | 0.12 |  | (0.20 | )
Diluted earnings (loss) per ordinary share attributable to Pentair plc | $ | 1.11 |  | $ | 2.62 |  | $ | (0.84 | )
Anti-dilutive stock options excluded from the calculation of diluted earnings per share | 0.5 |  | 0.2 |  | 16.0 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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