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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Schedule of the reconciliation of basic weighted average common shares outstanding to diluted weighted average common shares outstanding | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(dollars and shares in millions, except per share data) |  | 2020 |  | 2019 |  | 2018
Net income attributable to Amphenol Corporation shareholders | ​ | $ | 1,203.4 | ​ | $ | 1,155.0 | ​ | $ | 1,205.0
Basic weighted average common shares outstanding | ​ |  | 298.0 | ​ |  | 297.5 | ​ |  | 301.2
Effect of dilutive stock options | ​ |  | 9.5 | ​ |  | 10.4 | ​ |  | 11.4
Diluted weighted average common shares outstanding | ​ |  | 307.5 | ​ |  | 307.9 | ​ |  | 312.6
Earnings per share attributable to Amphenol Corporation shareholders: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic | ​ | $ | 4.04 | ​ | $ | 3.88 | ​ | $ | 4.00
Diluted | ​ | $ | 3.91 | ​ | $ | 3.75 | ​ | $ | 3.85
Pro Forma [Member] |
Schedule Of Earnings Per Share Pro Forma Basic And Diluted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(dollars and shares in millions, except per share data) |  | 2020 |  | 2019 |  | 2018
Net income attributable to Amphenol Corporation shareholders | ​ | $ | 1,203.4 | ​ | $ | 1,155.0 | ​ | $ | 1,205.0
Basic weighted average common shares outstanding | ​ |  | 596.1 | ​ |  | 595.0 | ​ |  | 602.4
Effect of dilutive stock options | ​ |  | 18.9 | ​ |  | 20.9 | ​ |  | 22.8
Diluted weighted average common shares outstanding | ​ |  | 615.0 | ​ |  | 615.9 | ​ |  | 625.2
Earnings per share attributable to Amphenol Corporation shareholders: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic | ​ | $ | 2.02 | ​ | $ | 1.94 | ​ | $ | 2.00
Diluted | ​ | $ | 1.96 | ​ | $ | 1.88 | ​ | $ | 1.93

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations on a pro forma basis, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References No definition available. + Details
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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/2009/role/commonPracticeRef -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 + Details
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