Earnings Per Share, Reconciliation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share
Net income from continuing operations attributable to Amphenol Corporation	$ 1,569.4	$ 1,203.4	$ 1,155.0
Income from discontinued operations attributable to Amphenol Corporation, net of income taxes of ($3.2) for 2021	21.4	0.0	0.0
Income taxes on income from discontinued operations attributable to Amphenol Corporation	3.2
Net income attributable to Amphenol Corporation	$ 1,590.8	$ 1,203.4	$ 1,155.0
Weighted average common shares outstanding - Basic (in shares)	597.9	596.1	595.0
Effect of dilutive stock options (in shares)	27.6	18.9	20.9
Weighted average common shares outstanding - Diluted (in shares)	625.5	615.0	615.9
Net income (loss) per common share attributable to Amphenol Corporation - Basic:
Continuing operations	$ 2.62	$ 2.02	$ 1.94
Discontinued operations, net of income taxes	0.04	0	0
Net income attributable to Amphenol Corporation - Basic	2.66	2.02	1.94
Net income (loss) per common share attributable to Amphenol Corporation - Diluted:
Continuing operations	2.51	1.96	1.88
Discontinued operations, net of income taxes	0.03	0	0
Net income attributable to Amphenol Corporation - Diluted	$ 2.54	$ 1.96	$ 1.88
Anti-dilutive common shares
Anti-dilutive stock options, excluded from the computations of earnings per share (in shares)	3.5	9.4	14.2