CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Millions	Ecolab Shareholders' Equity	Common Stock	Additional Paid-in Capital	Retained Earnings	AOCI (Loss)	Treasury Stock	Non-Controlling Interest	Total
Balance, beginning 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
Balance, beginning (in shares) at Dec. 31, 2021		364,139,362
Balance, beginning (Treasury, in shares) at Dec. 31, 2021						(77,255,713)
Increase (Decrease) in Stockholders' Equity
Net income	1,091.7			1,091.7			17.2	1,108.9
Other comprehensive income (loss) activity	(91.8)				(91.8)		(4.2)	(96.0)
Cash dividends declared (a)	(587.4)			(587.4)			(20.0)	(607.4)
Fair value adjustment of prior acquisition							0.6	0.6
Stock options and awards	117.6	$ 0.6	115.6			$ 1.4		117.6
Stock options (in shares)		276,059				14,525
Stock awards (in shares)		296,420				17,794
Reacquired shares	(518.2)					$ (518.2)		(518.2)
Reacquired shares (in shares)						(3,038,107)
Balance, Ending 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, Ending (in shares) at Dec. 31, 2022		364,711,841
Balance, ending (Treasury, in shares) at Dec. 31, 2022						(80,261,501)
Increase (Decrease) in Stockholders' Equity
Net income	1,372.3			1,372.3			20.7	1,393.0
Other comprehensive income (loss) activity	(123.8)				(123.8)		(2.2)	(126.0)
Cash dividends declared (a)	(615.7)			(615.7)			(13.5)	(629.2)
Changes in noncontrolling interest	(4.5)		(4.5)					(4.5)
Stock options and awards	194.0	$ 1.0	191.0			$ 2.0		194.0
Stock options (in shares)		802,645				14,629
Stock awards (in shares)		234,154				30,437
Reacquired shares	(13.7)					$ (13.7)		(13.7)
Reacquired shares (in shares)						(83,674)
Balance, Ending at Dec. 31, 2023	8,044.7	$ 365.7	6,766.7	10,075.4	(1,850.4)	$ (7,312.7)	27.5	$ 8,072.2
Balance, Ending (in shares) at Dec. 31, 2023		365,748,640						285,400,000
Balance, ending (Treasury, in shares) at Dec. 31, 2023						(80,300,109)
Increase (Decrease) in Stockholders' Equity
Net income	2,112.4			2,112.4			19.5	$ 2,131.9
Other comprehensive income (loss) activity	(131.6)				(131.6)			(131.6)
Cash dividends declared (a)	(670.7)			(670.7)			(15.1)	(685.8)
Stock options and awards	398.6	$ 2.1	392.9			$ 3.6		398.6
Stock options (in shares)		1,772,396				31,531
Stock awards (in shares)		297,139				51,791
Reacquired shares	(996.1)					$ (996.1)		(996.1)
Reacquired shares (in shares)						(4,246,642)
Balance, Ending at Dec. 31, 2024	$ 8,757.3	$ 367.8	$ 7,159.6	$ 11,517.1	$ (1,982.0)	$ (8,305.2)	$ 31.9	$ 8,789.2
Balance, Ending (in shares) at Dec. 31, 2024		367,818,175						283,400,000
Balance, ending (Treasury, in shares) at Dec. 31, 2024						(84,463,429)