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, 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	967.1			967.1			15.1	982.2
Other comprehensive income (loss) activity	(74.8)				(74.8)		(0.9)	(75.7)
Cash dividends declared (a)	(453.1)			(453.1)			(10.0)	(463.1)
Changes in noncontrolling interest	(4.5)		(4.5)					(4.5)
Stock options and awards	136.7	0.7	134.4			1.6		136.7
Reacquired shares	(11.7)					(11.7)		(11.7)
Balance, Ending at Sep. 30, 2023	7,795.8	365.4	6,710.1	9,832.8	(1,801.4)	(7,311.1)	26.7	7,822.5
Balance, beginning 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
Increase (Decrease) in Stockholders' Equity
Net income	404.0			404.0			5.4	409.4
Other comprehensive income (loss) activity	(39.6)				(39.6)		0.6	(39.0)
Cash dividends declared (a)	(151.2)			(151.2)			(3.1)	(154.3)
Stock options and awards	26.6	0.1	26.0			0.5		26.6
Reacquired shares	(0.7)					(0.7)		(0.7)
Balance, Ending at Sep. 30, 2023	7,795.8	365.4	6,710.1	9,832.8	(1,801.4)	(7,311.1)	26.7	7,822.5
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
Increase (Decrease) in Stockholders' Equity
Net income	1,639.5			1,639.5			12.9	1,652.4
Other comprehensive income (loss) activity	(3.4)				(3.4)		2.4	(1.0)
Cash dividends declared (a)	(486.5)			(486.5)			(15.1)	(501.6)
Stock options and awards	346.8	1.9	341.5			3.4		346.8
Reacquired shares	(993.3)					(993.3)		(993.3)
Balance, Ending at Sep. 30, 2024	8,547.8	367.6	7,108.2	11,228.4	(1,853.8)	(8,302.6)	27.7	8,575.5
Balance, beginning at Jun. 30, 2024	8,287.4	367.1	7,002.1	10,653.3	(1,899.4)	(7,835.7)	20.5	8,307.9
Increase (Decrease) in Stockholders' Equity
Net income	736.5			736.5			4.3	740.8
Other comprehensive income (loss) activity	45.6				45.6		2.9	48.5
Cash dividends declared (a)	(161.4)			(161.4)				(161.4)
Stock options and awards	108.6	0.5	106.1			2.0		108.6
Reacquired shares	(468.9)					(468.9)		(468.9)
Balance, Ending at Sep. 30, 2024	$ 8,547.8	$ 367.6	$ 7,108.2	$ 11,228.4	$ (1,853.8)	$ (8,302.6)	$ 27.7	$ 8,575.5