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Selected Quarterly Financial Data (Unaudited), Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Selected Quarterly Financial Data (Unaudited) |  |  |  |  |  |  |  |  |  |  |
Excess tax benefit from option exercises | $ 16.8 | $ 1.6 | $ 12.9 | $ 6.8 | $ 5.7 | $ 7.0 | $ 3.0 | $ 4.1 | $ 38.1 | $ 19.8 | $ 66.6
Acquisition-related expenses |  |  | 8.9 | 16.5 | 8.5 |  |  |  | 25.4 | 8.5 | 4.0
Acquisition-related expenses, net of tax |  |  | $ 7.8 | $ 13.2 | $ 7.2 |  |  |  | 21.0 | 7.2 | 3.7
Excess tax benefits related to stock-based compensation ( in dollars per share) |  | $ 0.01 | $ 0.04 | $ 0.02 | $ 0.02 |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  | $ (14.3) |  |  |  |  |  |  | (14.3) | 0.0 | $ 0.0
Gain (loss) on extinguishment of debt, after tax |  | $ (12.5) |  |  |  |  |  |  | $ (12.5) |  |
Gain (loss) on extinguishment of debt, per diluted share |  | $ (0.04) |  |  |  |  |  |  | $ (0.04) |  |
Net income (loss) per common share-Diluted, acquisition-related expenses (in dollars per share) |  |  | $ (0.03) | $ (0.04) | $ (0.02) |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  | $ (14.5) |  |  |  |  | $ (14.5) |
Impact on earnings per share related to Tax Cuts and Jobs Act (in dollars per share) |  |  |  |  | $ 0.04 |  |  |  |  |  |
Operating income (loss), aggregate effect |  |  | $ (8.9) | $ (16.5) | $ (8.5) |  |  |  |  |  |
Net income, aggregate effect | 16.8 | $ (10.9) | 5.1 | (6.4) | 13.0 | 7.0 | 3.0 | 4.1 |  |  |
Net income attributable to Amphenol Corporation shareholders, aggregate effect | $ 16.8 | $ (10.9) | $ 5.1 | $ (6.4) | $ 13.0 | $ 7.0 | $ 3.0 | $ 4.1 |  |  |
Earnings per share - diluted, aggregate effect (in dollars per share) | $ 0.05 | $ (0.03) | $ 0.01 | $ (0.02) | $ 0.04 | $ 0.02 | $ 0.01 | $ 0.01 |  |  |

X
- Definition Represents the after tax amount of acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References No definition available. + Details
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period related to acquisition-related expenses. + References No definition available. + Details
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- Definition The aggregate effect on earnings per share, diluted for the period. The effects are for excess tax benefits on stock-based compensation, the Tax Act Charge (benefit), refinancing-related costs, and acquisition costs, if applicable. + References No definition available. + Details
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- Definition The earnings per share (diluted) impact for the period associated with the amount of excess tax benefits related to stock-based compensation. + References No definition available. + Details
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- Definition The impact on diluted earnings per share related to the Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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- Definition The aggregate effect of net income (loss) attributable to parent for the period. The effects are for excess tax benefits on stock-based compensation, the Tax Act Charge (benefit), refinancing-related costs, and acquisition costs, if applicable. + References No definition available. + Details
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- Definition The aggregate effect of net income (loss) for the period. The effects are for excess tax benefits on stock-based compensation, the Tax Act Charge (benefit), refinancing-related costs, and acquisition costs, if applicable. + References No definition available. + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460 + Details
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- Definition Amount of tax benefit from exercise of option under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116856206&loc=SL79508275-113901 + Details
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- Definition The difference between the reacquisition price and the net carrying amount of the extinguished debt recognized currently as a component of income in the period of extinguishment, net of tax. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12317-112629 + Details
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- Definition Amount of income tax expense (benefit) from effect of Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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