CONSOLIDATED STATEMENT OF EQUITY - USD ($) shares in Millions, $ 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	193.6			193.6			2.9	196.5
Other comprehensive income (loss) activity	79.9				79.9		(0.7)	79.2
Cash dividends declared	(137.3)			(137.3)			(9.4)	(146.7)
Stock options and awards	51.4	0.4	50.7			0.3		51.4
Reacquired shares	(61.8)					(61.8)		(61.8)
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
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
Balance (in shares) at Dec. 31, 2021								286.9
Increase (Decrease) in Stockholders' Equity
Net income	171.9			171.9			2.8	$ 174.7
Other comprehensive income (loss) activity	71.2				71.2		(1.0)	70.2
Cash dividends declared	(146.0)			(146.0)			(7.8)	(153.8)
Fair value adjustment of prior acquisition							0.6	0.6
Stock options and awards	37.4	0.4	36.9			0.1		37.4
Reacquired shares	(277.1)					(277.1)		(277.1)
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
Balance (in shares) at Mar. 31, 2022								285.7