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Selected Quarterly Financial Data (Unaudited), Additional Information (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income tax expense (benefit) |  |  |  |  |  |  |  |  | $ 691.7 | $ 308.5 | $ 280.5
Net income | $ (100.4) | $ 280.3 | $ 253.6 | $ 227.3 | $ 238.3 | $ 227.1 | $ 208.7 | $ 158.4 | 660.7 | 832.6 | 772.3
Net income attributable to Amphenol Corporation shareholders | $ (103.4) | $ 277.5 | $ 251.5 | $ 224.9 | $ 235.4 | $ 224.3 | $ 206.5 | $ 156.6 | $ 650.5 | $ 822.9 | $ 763.5
Net income (loss) per common share—Diluted (in dollars per share) | $ (0.34) | $ 0.88 | $ 0.80 | $ 0.71 | $ 0.75 | $ 0.71 | $ 0.65 | $ 0.50 | $ 2.06 | $ 2.61 | $ 2.41
Operating income | $ 399.4 | $ 377.9 | $ 336.2 | $ 314.1 | $ 339.1 | $ 326.3 | $ 300.3 | $ 239.4 | $ 1,427.6 | $ 1,205.2 | $ 1,104.7
Acquisition-related expenses |  |  | 4.0 |  |  |  |  |  | $ 4.0 | $ 36.6 | $ 5.7
Acquisition-related expenses, net of tax |  |  | 3.7 |  |  |  |  |  |  |  |
Provisional Tax Act Charge | $ 398.5 |  |  |  |  |  |  |  |  |  |
Impact on earnings per share related to Tax Cuts and Jobs Act (in dollars per share) | $ (1.26) |  |  |  |  |  |  |  |  |  |
Anti-dilutive stock options, excluded from the computations of earning per share (in shares) | 12.4 |  |  |  |  |  |  |  | 1.6 | 8.5 | 6.3
Earnings per share - diluted change (in dollars per share) | $ 0.01 |  |  |  |  |  |  |  |  |  |
Operating income (loss), aggregate effect |  |  | (4.0) |  |  |  |  |  |  |  |
Net income, aggregate effect | $ (377.7) |  | 17.5 |  |  |  |  |  |  |  |
Net income attributable to Amphenol Corporation shareholders, aggregate effect | $ (377.7) |  | $ 17.5 |  |  |  |  |  |  |  |
Earnings per share - diluted, aggregate effect (in dollars per share) | $ (1.20) |  | $ 0.06 |  |  |  |  |  |  |  |
FCI Asia Pte Ltd (“FCI”) |  |  |  |  |  |  |  |  |  |  |
Acquisition-related expenses |  |  |  |  |  |  |  | 30.3 |  |  |
Acquisition-related expenses, net of tax |  |  |  |  |  |  |  | 27.3 |  |  | $ 5.7
Acquisition-related costs |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  | (5.8) |  |  |  |  |
Net income attributable to Amphenol Corporation shareholders |  |  |  |  |  | $ (5.8) |  |  |  |  |
Net income (loss) per common share—Diluted (in dollars per share) |  |  | $ (0.01) |  |  | $ (0.02) |  |  |  |  |
Operating income |  |  |  |  |  | $ (6.3) |  |  |  |  |
Acquisition-related expenses |  |  | $ 4.0 |  |  |  |  |  |  |  |
Acquisition-related expenses, net of tax |  |  | 3.7 |  |  |  |  |  |  |  |
Acquisition-related costs | FCI Asia Pte Ltd (“FCI”) |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  | (27.3) |  |  |
Net income attributable to Amphenol Corporation shareholders |  |  |  |  |  |  |  | $ (27.3) |  |  |
Net income (loss) per common share—Diluted (in dollars per share) |  |  |  |  |  |  |  | $ (0.09) |  |  |
Operating income |  |  |  |  |  |  |  | $ (30.3) |  |  |
Impact of ASU 2016-09 |  |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) | $ (20.8) | (16.6) | $ (21.2) | (8.0) |  |  |  |  | $ (66.6) |  |
Net income |  | 16.6 |  | 8.0 |  |  |  |  |  |  |
Net income attributable to Amphenol Corporation shareholders |  | $ 16.6 |  | $ 8.0 |  |  |  |  |  |  |
Net income (loss) per common share—Diluted (in dollars per share) | $ 0.07 | $ 0.05 | $ 0.07 | $ 0.02 |  |  |  |  |  |  |

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