CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Millions, $ in Millions	TOTAL ECOLAB SHAREHOLDERS' EQUITY	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	RETAINED EARNINGS	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	TREASURY STOCK	NON-CONTROLLING INTEREST	Total
Balance at Dec. 31, 2021	$ 7,224.2	$ 364.1	$ 6,464.6	$ 8,814.5	$ (1,634.8)	$ (6,784.2)	$ 28.9	$ 7,253.1
Increase (Decrease) in Stockholders' Equity
Net income	480.2			480.2			7.2	487.4
Other comprehensive income (loss) activity	16.9				16.9		(3.9)	13.0
Cash dividends declared (a)	(291.4)			(291.4)			(7.8)	(299.2)
Fair value adjustment of prior acquisition							0.6	0.6
Stock options and awards	66.3	0.4	65.2			0.7		66.3
Reacquired shares	(402.8)					(402.8)		(402.8)
Balance at Jun. 30, 2022	7,093.4	364.5	6,529.8	9,003.3	(1,617.9)	(7,186.3)	25.0	7,118.4
Balance at Mar. 31, 2022	7,081.6	364.5	6,501.5	8,840.4	(1,563.6)	(7,061.2)	23.5	7,105.1
Increase (Decrease) in Stockholders' Equity
Net income	308.3			308.3			4.4	312.7
Other comprehensive income (loss) activity	(54.3)				(54.3)		(2.9)	(57.2)
Cash dividends declared (a)	(145.4)			(145.4)				(145.4)
Stock options and awards	28.9		28.3			0.6		28.9
Reacquired shares	(125.7)					(125.7)		(125.7)
Balance at Jun. 30, 2022	7,093.4	364.5	6,529.8	9,003.3	(1,617.9)	(7,186.3)	25.0	7,118.4
Balance at Dec. 31, 2022	7,236.1	364.7	6,580.2	9,318.8	(1,726.6)	(7,301.0)	22.5	$ 7,258.6
Balance (in shares) at Dec. 31, 2022								284.5
Increase (Decrease) in Stockholders' Equity
Net income	563.1			563.1			9.7	$ 572.8
Other comprehensive income (loss) activity	(35.2)				(35.2)		(1.5)	(36.7)
Cash dividends declared (a)	(301.9)			(301.9)			(6.9)	(308.8)
Changes in noncontrolling interest	(4.5)		(4.5)					(4.5)
Stock options and awards	110.0	0.6	108.4			1.0		110.0
Reacquired shares	(10.9)					(10.9)		(10.9)
Balance at Jun. 30, 2023	7,556.7	365.3	6,684.1	9,580.0	(1,761.8)	(7,310.9)	23.8	$ 7,580.5
Balance (in shares) at Jun. 30, 2023								285.0
Balance at Mar. 31, 2023	7,344.2	365.0	6,626.5	9,401.3	(1,737.2)	(7,311.4)	20.8	$ 7,365.0
Increase (Decrease) in Stockholders' Equity
Net income	329.7			329.7			5.0	334.7
Other comprehensive income (loss) activity	(24.6)				(24.6)		(2.0)	(26.6)
Cash dividends declared (a)	(151.0)			(151.0)				(151.0)
Changes in noncontrolling interest	(4.5)		(4.5)					(4.5)
Stock options and awards	63.2	0.3	62.1			0.8		63.2
Reacquired shares	(0.3)					(0.3)		(0.3)
Balance at Jun. 30, 2023	$ 7,556.7	$ 365.3	$ 6,684.1	$ 9,580.0	$ (1,761.8)	$ (7,310.9)	$ 23.8	$ 7,580.5
Balance (in shares) at Jun. 30, 2023								285.0