Earnings Per Share, Reconciliation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share
Net income attributable to Amphenol Corporation shareholders									$ 650.5	$ 822.9	$ 763.5
Basic weighted average common shares outstanding (in shares)									305.7	308.3	309.1
Effect of dilutive stock options (in shares)									10.8	6.9	7.4
Diluted weighted average common shares outstanding (in shares)									316.5	315.2	316.5
Earnings per share attributable to Amphenol Corporation shareholders:
Basic (in dollars per share)	$ (0.34)	$ 0.91	$ 0.82	$ 0.73	$ 0.76	$ 0.73	$ 0.67	$ 0.51	$ 2.13	$ 2.67	$ 2.47
Diluted (in dollars per share)	$ (0.34)	$ 0.88	$ 0.80	$ 0.71	$ 0.75	$ 0.71	$ 0.65	$ 0.50	$ 2.06	$ 2.61	$ 2.41
Anti-dilutive common shares
Anti-dilutive stock options, excluded from the computations of earning per share (in shares)	12.4								1.6	8.5	6.3