CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Net sales	$ 15,320.2	$ 14,187.8	$ 12,733.1
Cost of sales (including special charges (a))	9,154.9	8,831.0	7,615.8
Selling, general and administrative expenses	4,061.6	3,653.8	3,416.1
Special (gains) and charges	111.4	140.5	102.6
Operating income	1,992.3	1,562.5	1,598.6
Other (income) expense (b)	(59.9)	(24.5)	(33.9)
Interest expense, net	296.7	243.6	218.3
Income before income taxes	1,755.5	1,343.4	1,414.2
Provision for income taxes	362.5	234.5	270.2
Net income including noncontrolling interest	1,393.0	1,108.9	1,144.0
Net income attributable to noncontrolling interest	20.7	17.2	14.1
Net income attributable to Ecolab	$ 1,372.3	$ 1,091.7	$ 1,129.9
Earnings attributable to Ecolab per common share
Basic (in dollars per share)	$ 4.82	$ 3.83	$ 3.95
Diluted (in dollars per share)	$ 4.79	$ 3.81	$ 3.91
Weighted-average common shares outstanding
Basic (in shares)	285.0	285.2	286.3
Diluted (in shares)	286.5	286.6	289.1
Product and equipment sales
Net sales	$ 12,316.8	$ 11,446.2	$ 10,153.3
Cost of sales (including special charges (a))	7,389.2	7,212.8	6,100.9
Service and lease sales
Net sales	3,003.4	2,741.6	2,579.8
Cost of sales (including special charges (a))	$ 1,765.7	$ 1,618.2	$ 1,514.9