Earnings Per Share, Reconciliation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share
Net income attributable to Amphenol Corporation shareholders	$ 242.1	$ 267.5
Basic weighted average common shares outstanding (in shares)	297.4	298.1
Effect of dilutive stock options (in shares)	9.1	10.5
Diluted weighted average common shares outstanding (in shares)	306.5	308.6
Earnings per share attributable to Amphenol Corporation shareholders:
Basic (in dollars per share)	$ 0.81	$ 0.90
Diluted (in dollars per share)	$ 0.79	$ 0.87
Anti-dilutive common shares
Anti-dilutive stock options, excluded from the computations of earnings per share (in shares)	3.1	6.3