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, 2020	$ 6,166.5	$ 362.6	$ 6,235.0	$ 8,243.0	$ (1,994.4)	$ (6,679.7)	$ 35.0	$ 6,201.5
Balance, beginning (in shares) at Dec. 31, 2020		362,553,443				(76,801,025)
Increase (Decrease) in Stockholders' Equity
Net income	1,129.9			1,129.9			14.1	1,144.0
Other comprehensive income (loss) activity	359.6				359.6		(3.2)	356.4
Cash dividends declared (a)	(558.4)			(558.4)			(17.0)	(575.4)
Stock options and awards	233.2	$ 1.5	229.6			$ 2.1		233.2
Stock options (in shares)		1,270,757				29,684
Stock awards (in shares)		315,162				17,760
Reacquired shares	(106.6)					$ (106.6)		(106.6)
Reacquired shares (in shares)						(502,132)
Balance, Ending 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, Ending (in shares) at Dec. 31, 2021		364,139,362				(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				(80,261,501)		284,500,000
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				(80,300,109)		285,400,000