Earnings Per Share, Reconciliation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share
Net income from continuing operations attributable to Amphenol Corporation	$ 472.5	$ 367.2	$ 898.2	$ 696.7
Income from discontinued operations attributable to Amphenol Corporation, net of income taxes of ($0.3) for 2021	0.0	2.6	0.0	2.6
Income taxes on income from discontinued operations attributable to Amphenol Corporation		0.3		0.3
Net income attributable to Amphenol Corporation	$ 472.5	$ 369.8	$ 898.2	$ 699.3
Weighted average common shares outstanding - Basic (in shares)	596.2	597.4	597.3	597.9
Effect of dilutive stock options (in shares)	23.5	26.4	25.3	26.0
Weighted average common shares outstanding - Diluted (in shares)	619.7	623.8	622.6	623.9
Net income per common share attributable to Amphenol Corporation - Basic:
Net income per common share attributable to Amphenol Corporation - Basic, Continuing operations (in dollars per share)	$ 0.79	$ 0.61	$ 1.50	$ 1.17
Net income per common share attributable to Amphenol Corporation - Basic, Discontinued operations, net of income taxes (in dollars per share)	0	0	0	0
Net income per common share attributable to Amphenol Corporation - Basic (in dollars per share)	0.79	0.62	1.50	1.17
Net income per common share attributable to Amphenol Corporation - Diluted:
Net income per common share attributable to Amphenol Corporation - Diluted, Continuing operations (in dollars per share)	0.76	0.59	1.44	1.12
Net income per common share attributable to Amphenol Corporation - Diluted, Discontinued operations, net of income taxes (in dollars per share)	0	0	0	0
Net income per common share attributable to Amphenol Corporation - Diluted (in dollars per share)	$ 0.76	$ 0.59	$ 1.44	$ 1.12
Anti-dilutive common shares
Anti-dilutive stock options, excluded from the computations of earnings per share (in shares)	11.1	3.8	7.6	2.2