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	504.4			504.4			5.7	510.1
Other comprehensive income (loss) activity	283.8				283.8		(1.4)	282.4
Cash dividends declared (a)	(274.6)			(274.6)			(12.1)	(286.7)
Stock options and awards	99.6	0.6	98.3			0.7		99.6
Reacquired shares	(70.6)					(70.6)		(70.6)
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
Balance at Mar. 31, 2021	6,292.3	363.0	6,285.7	8,299.3	(1,914.5)	(6,741.2)	27.8	6,320.1
Increase (Decrease) in Stockholders' Equity
Net income	310.8			310.8			2.8	313.6
Other comprehensive income (loss) activity	203.9				203.9		(0.7)	203.2
Cash dividends declared (a)	(137.3)			(137.3)			(2.7)	(140.0)
Stock options and awards	48.2	0.2	47.6			0.4		48.2
Reacquired shares	(8.8)					(8.8)		(8.8)
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
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	480.2			480.2			7.2	487.4
Other comprehensive income (loss) activity	16.9				16.9		(3.9)	13.0
Cash dividends declared (a)	(291.4)			(291.4)			(7.8)	(299.2)
Fair value adjustment of prior acquisition							0.6	0.6
Stock options and awards	66.3	0.4	65.2			0.7		66.3
Reacquired shares	(402.8)					(402.8)		(402.8)
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
Balance at Mar. 31, 2022	7,081.6	364.5	6,501.5	8,840.4	(1,563.6)	(7,061.2)	23.5	7,105.1
Increase (Decrease) in Stockholders' Equity
Net income	308.3			308.3			4.4	312.7
Other comprehensive income (loss) activity	(54.3)				(54.3)		(2.9)	(57.2)
Cash dividends declared (a)	(145.4)			(145.4)				(145.4)
Stock options and awards	28.9		28.3			0.6		28.9
Reacquired shares	(125.7)					(125.7)		(125.7)
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