CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF INCOME
Net sales	$ 2,129.0	$ 1,840.8	$ 5,977.3	$ 5,067.4
Cost of sales	1,440.8	1,234.7	4,037.4	3,392.8
Gross profit	688.2	606.1	1,939.9	1,674.6
Acquisition-related expenses				4.0
Selling, general and administrative expenses	244.0	228.2	710.6	642.4
Operating income	444.2	377.9	1,229.3	1,028.2
Interest expense	(24.8)	(24.6)	(75.3)	(67.3)
Other income, net	0.2	5.1	2.5	12.9
Income before income taxes	419.6	358.4	1,156.5	973.8
Provision for income taxes	(100.0)	(78.1)	(280.8)	(212.7)
Net income	319.6	280.3	875.7	761.1
Less: Net income attributable to noncontrolling interests	(3.0)	(2.8)	(8.8)	(7.2)
Net income attributable to Amphenol Corporation	$ 316.6	$ 277.5	$ 866.9	$ 753.9
Net income per common share — Basic (in dollars per share)	$ 1.05	$ 0.91	$ 2.87	$ 2.47
Weighted average common shares outstanding — Basic (in shares)	300.5	305.0	301.7	305.8
Net income per common share — Diluted (in dollars per share)	$ 1.01	$ 0.88	$ 2.76	$ 2.39
Weighted average common shares outstanding — Diluted (in shares)	312.4	315.7	313.6	316.1
Dividends declared per share (in dollars per share)	$ 0.23	$ 0.19	$ 0.65	$ 0.51