Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Consolidated Statements of Income
Net sales	$ 7,011.3	$ 6,286.4	$ 5,568.7
Cost of sales	4,701.4	4,246.4	3,789.2
Gross profit	2,309.9	2,040.0	1,779.5
Acquisition-related expenses	4.0	36.6	5.7
Selling, general and administrative expenses	878.3	798.2	669.1
Operating income	1,427.6	1,205.2	1,104.7
Interest expense	(92.3)	(72.6)	(68.3)
Other income, net	17.1	8.5	16.4
Income before income taxes	1,352.4	1,141.1	1,052.8
Provision for income taxes	(691.7)	(308.5)	(280.5)
Net income	660.7	832.6	772.3
Less: Net income attributable to noncontrolling interests	(10.2)	(9.7)	(8.8)
Net income attributable to Amphenol Corporation	$ 650.5	$ 822.9	$ 763.5
Net income per common share — Basic (in dollars per share)	$ 2.13	$ 2.67	$ 2.47
Weighted average common shares outstanding — Basic (in shares)	305.7	308.3	309.1
Net income per common share — Diluted (in dollars per share)	$ 2.06	$ 2.61	$ 2.41
Weighted average common shares outstanding — Diluted (in shares)	316.5	315.2	316.5
Dividends declared per common share (in dollars per share)	$ 0.7	$ 0.58	$ 0.53