Earnings Per Share, Reconciliation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Earnings Per Share
Net Income (Loss)	$ 737.8	$ 548.7
Weighted average common shares outstanding - Basic (in shares)	1,209.8	1,200.0
Effect of dilutive stock options (in shares)	56.4	55.9
Weighted average common shares outstanding - Diluted (in shares)	1,266.2	1,255.9
Net income attributable to Amphenol Corporation per common share - Basic:
Net income attributable to Amphenol Corporation per common share - Basic (in dollars per share)	$ 0.61	$ 0.46
Net income attributable to Amphenol Corporation per common share - Diluted:
Net income attributable to Amphenol Corporation per common share - Diluted (in dollars per share)	$ 0.58	$ 0.44
Anti-dilutive common shares
Anti-dilutive stock options, excluded from the computations of earnings per share (in shares)	8.2	0.2