CONSOLIDATED STATEMENT OF INCOME - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net sales	$ 3,320.8	$ 3,018.6	$ 9,368.5	$ 8,724.9
Cost of sales (including special charges (a))	2,016.7	1,769.6	5,572.7	5,125.5
Selling, general and administrative expenses	832.0	802.6	2,548.2	2,499.5
Special (gains) and charges	6.3	35.0	36.7	120.3
Operating income	465.8	411.4	1,210.9	979.6
Other (income) expense (b)	(13.0)	(15.1)	(27.5)	(45.6)
Interest expense, net (c)	76.4	134.8	173.7	241.8
Income before income taxes	402.4	291.7	1,064.7	783.4
Provision for income taxes	73.8	42.4	226.0	103.5
Net income from continuing operations including noncontrolling interest	328.6	249.3	838.7	679.9
Net income from continuing operations attributable to noncontrolling interest	4.1	3.1	9.8	12.8
Net income from continuing operations attributable to Ecolab	324.5	246.2	828.9	667.1
Net loss from discontinued operations, net of tax (Note 4) (d)				(2,172.5)
Net income (loss) attributable to Ecolab	$ 324.5	$ 246.2	$ 828.9	$ (1,505.4)
Basic EPS
Continuing operations	$ 1.13	$ 0.86	$ 2.90	$ 2.32
Discontinued operations				(7.56)
Earnings attributable to Ecolab	1.13	0.86	2.90	(5.24)
Diluted EPS
Continuing operations	1.12	0.85	2.87	2.29
Discontinued operations				(7.47)
Earnings attributable to Ecolab	$ 1.12	$ 0.85	$ 2.87	$ (5.18)
Weighted-average common shares outstanding
Basic (in shares)	286.4	285.4	286.1	287.5
Diluted (in shares)	289.2	288.4	289.0	290.8
Product and sold equipment
Net sales	$ 2,653.8	$ 2,426.4	$ 7,461.6	$ 7,017.5
Cost of sales (including special charges (a))	1,625.1	1,405.4	4,452.9	4,071.6
Service and lease equipment
Net sales	667.0	592.2	1,906.9	1,707.4
Cost of sales (including special charges (a))	$ 391.6	$ 364.2	$ 1,119.8	$ 1,053.9