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Earnings Per Share - Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
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Mar. 31, 2016 | Mar. 28, 2015
Computation Of Earnings Per Share Line Items |  |
Net income | $ 107.4 | $ 113.9
Income (Loss) from Continuing Operations Attributable to Parent | $ 107.4 | $ 118.2
Weighted average common shares outstanding |  |
Basic (shares) | 180.7 | 180.1
Dilutive impact of stock options and restricted stock units (shares) | 1.7 | 2.6
Diluted (shares) | 182.4 | 182.7
Earnings per common share attributable to Pentair plc |  |
Income (Loss) from Continuing Operations, Per Basic Share | $ 0.59 | $ 0.66
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share | 0.00 | (0.03)
Basic (USD per share) | 0.59 | 0.63
Income (Loss) from Continuing Operations, Per Diluted Share | 0.59 | 0.65
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share | 0 | (0.03)
Diluted (USD per share) | $ 0.59 | $ 0.62
Anti-dilutive stock options excluded from the calculation of diluted earnings per share | 3.1 | 1.2

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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