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Earnings (Loss) Per Share | 12 Months Ended
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Dec. 31, 2012
Earnings (Loss) Per Share |
5. |  | 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 The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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