CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net sales	$ 15,741.4	$ 15,320.2	$ 14,187.8
Cost of sales (including special charges (a))	8,899.7	9,154.9	8,831.0
Selling, general and administrative expenses	4,228.2	4,061.6	3,653.8
Special (gains) and charges	(188.9)	111.4	140.5
Operating income	2,802.4	1,992.3	1,562.5
Other (income) expense (b)	(51.3)	(59.9)	(24.5)
Interest expense, net	282.5	296.7	243.6
Income before income taxes	2,571.2	1,755.5	1,343.4
Provision for income taxes	439.3	362.5	234.5
Net income including noncontrolling interest	2,131.9	1,393.0	1,108.9
Net income attributable to noncontrolling interest	19.5	20.7	17.2
Net income attributable to Ecolab	$ 2,112.4	$ 1,372.3	$ 1,091.7
Earnings attributable to Ecolab per common share
Basic (in dollars per share)	$ 7.43	$ 4.82	$ 3.83
Diluted (in dollars per share)	$ 7.37	$ 4.79	$ 3.81
Weighted-average common shares outstanding
Basic (in shares)	284.3	285.0	285.2
Diluted (in shares)	286.6	286.5	286.6
Product and equipment sales
Net sales	$ 12,473.6	$ 12,316.8	$ 11,446.2
Cost of sales (including special charges (a))	6,990.0	7,389.2	7,212.8
Service and lease sales
Net sales	3,267.8	3,003.4	2,741.6
Cost of sales (including special charges (a))	$ 1,909.7	$ 1,765.7	$ 1,618.2