CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Millions, $ 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, 2022	$ 7,236.1	$ 364.7	$ 6,580.2	$ 9,318.8	$ (1,726.6)	$ (7,301.0)	$ 22.5	$ 7,258.6
Increase (Decrease) in Stockholders' Equity
Net income	233.4			233.4			4.7	238.1
Other comprehensive income (loss)	(10.6)				(10.6)		0.5	(10.1)
Cash dividends declared (a)	(150.9)			(150.9)			(6.9)	(157.8)
Stock options and awards	46.8	0.3	46.3			0.2		46.8
Reacquired shares	(10.6)					(10.6)		(10.6)
Balance, Ending 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
Balance, beginning 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, beginning (in shares) at Dec. 31, 2023								285.4
Increase (Decrease) in Stockholders' Equity
Net income	412.1			412.1			4.5	$ 416.6
Other comprehensive income (loss)	(30.8)				(30.8)		0.5	(30.3)
Cash dividends declared (a)	(163.0)			(163.0)			(12.5)	(175.5)
Stock options and awards	152.6	1.1	150.9			0.6		152.6
Reacquired shares	(210.0)					(210.0)		(210.0)
Balance, Ending at Mar. 31, 2024	$ 8,205.6	$ 366.8	$ 6,917.6	$ 10,324.5	$ (1,881.2)	$ (7,522.1)	$ 20.0	$ 8,225.6
Balance, Ending (in shares) at Mar. 31, 2024								285.6