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Earnings Per Share, Pro Forma Earnings Per Share Reconciliation (Details) $ / shares in Units, shares in Millions, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 27, 2021 | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares
Net income attributable to Amphenol Corporation shareholders | $ |  | $ 357.0 | $ 346.6 | $ 257.7 | $ 242.1 | $ 318.7 | $ 280.3 | $ 288.4 | $ 267.5 | $ 1,203.4 | $ 1,155.0 | $ 1,205.0
Effect of dilutive stock options (in shares) |  |  |  |  |  |  |  |  |  | 9.5 | 10.4 | 11.4
Pro Forma [Member] |  |  |  |  |  |  |  |  |  |  |  |
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 (in shares) |  |  |  |  |  |  |  |  |  | 18.9 | 20.9 | 22.8
Diluted weighted average common shares outstanding |  |  |  |  |  |  |  |  |  | 615.0 | 615.9 | 625.2
Pro Forma Earnings per share attributable to Amphenol Corporation shareholders |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ / shares |  |  |  |  |  |  |  |  |  | $ 2.02 | $ 1.94 | $ 2.00
Diluted | $ / shares |  |  |  |  |  |  |  |  |  | $ 1.96 | $ 1.88 | $ 1.93
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |
Pro Forma Earnings per share attributable to Amphenol Corporation shareholders |  |  |  |  |  |  |  |  |  |  |  |
Stock split conversion ratio | 2 |  |  |  |  |  |  |  |  |  |  |

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