CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ 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, 2020	$ 6,166.5	$ 362.6	$ 6,235.0	$ 8,243.0	$ (1,994.4)	$ (6,679.7)	$ 35.0	$ 6,201.5
Increase (Decrease) in Stockholders' Equity
Net income	828.9			828.9			9.8	838.7
Other comprehensive income (loss)	260.9				260.9		(1.8)	259.1
Cash dividends declared (a)	(412.1)			(412.1)			(14.7)	(426.8)
Stock options and awards	167.1	1.1	164.8			1.2		167.1
Reacquired shares	(77.8)					(77.8)		(77.8)
Balance at Sep. 30, 2021	6,933.5	363.7	6,399.8	8,659.8	(1,733.5)	(6,756.3)	28.3	6,961.8
Balance at Jun. 30, 2021	6,709.1	363.2	6,333.3	8,472.8	(1,710.6)	(6,749.6)	27.2	6,736.3
Increase (Decrease) in Stockholders' Equity
Net income	324.5			324.5			4.1	328.6
Other comprehensive income (loss)	(22.9)				(22.9)		(0.4)	(23.3)
Cash dividends declared (a)	(137.5)			(137.5)			(2.6)	(140.1)
Stock options and awards	67.4	0.5	66.5			0.4		67.4
Reacquired shares	(7.1)					(7.1)		(7.1)
Balance at Sep. 30, 2021	6,933.5	363.7	6,399.8	8,659.8	(1,733.5)	(6,756.3)	28.3	6,961.8
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	827.3			827.3			12.1	839.4
Other comprehensive income (loss)	(195.7)				(195.7)		(6.0)	(201.7)
Cash dividends declared (a)	(436.7)			(436.7)			(8.3)	(445.0)
Fair value adjustment of prior acquisition							0.6	0.6
Stock options and awards	88.9	0.5	87.2			1.2		88.9
Reacquired shares	(445.4)					(445.4)		(445.4)
Balance at Sep. 30, 2022	7,062.6	364.6	6,551.8	9,205.1	(1,830.5)	(7,228.4)	27.3	7,089.9
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
Increase (Decrease) in Stockholders' Equity
Net income	347.1			347.1			4.9	352.0
Other comprehensive income (loss)	(212.6)				(212.6)		(2.1)	(214.7)
Cash dividends declared (a)	(145.3)			(145.3)			(0.5)	(145.8)
Stock options and awards	22.6	0.1	22.0			0.5		22.6
Reacquired shares	(42.6)					(42.6)		(42.6)
Balance at Sep. 30, 2022	$ 7,062.6	$ 364.6	$ 6,551.8	$ 9,205.1	$ (1,830.5)	$ (7,228.4)	$ 27.3	$ 7,089.9