Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share
Net income attributable to Amphenol Corporation shareholders	$ 251.5	$ 206.5	$ 476.4	$ 363.2
Basic weighted average common shares outstanding (in shares)	305.8	308.2	306.2	307.9
Effect of dilutive stock options (in shares)	10.3	7.2	10.1	6.9
Diluted weighted average common shares outstanding (in shares)	316.1	315.4	316.3	314.8
Earnings per share attributable to Amphenol Corporation shareholders:
Basic (in dollars per share)	$ 0.82	$ 0.67	$ 1.56	$ 1.18
Diluted (in dollars per share)	$ 0.80	$ 0.65	$ 1.51	$ 1.15
Anti-dilutive common shares
Anti-dilutive stock options, excluded from the computations of earning per share (in shares)	1.7	8.2	1.0	10.0

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.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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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.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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