Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share
Net income attributable to Amphenol Corporation shareholders	$ 277.5	$ 224.3	$ 753.9	$ 587.5
Basic weighted average common shares outstanding (in shares)	305.0	308.9	305.8	308.3
Effect of dilutive stock options (in shares)	10.7	6.8	10.3	6.8
Diluted weighted average common shares outstanding (in shares)	315.7	315.7	316.1	315.1
Earnings per share attributable to Amphenol Corporation shareholders:
Basic (in dollars per share)	$ 0.91	$ 0.73	$ 2.47	$ 1.91
Diluted (in dollars per share)	$ 0.88	$ 0.71	$ 2.39	$ 1.86
Anti-dilutive common shares
Anti-dilutive stock options, excluded from the computations of earning per share (in shares)	5.3	13.2	2.1	11.0