GOODWILL AND OTHER INTANGIBLE ASSETS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Changes in the carrying amount of goodwill for each of the company's reportable segments
Impairment of goodwill			$ 0.0
Changes in the carrying amount of goodwill
Beginning goodwill			8,012.7
Ending goodwill	$ 8,098.4		8,098.4
Future estimated amortization expense related to amortizable other identifiable intangible assets
Estimated expense for the remaining six-month period	76.0		76.0
Total amortization expense related to other intangible assets	77.4	$ 80.6	229.8	$ 238.8
Nalco Holding Company ("Nalco") | Trademarks
Changes in the carrying amount of goodwill
Impairment of indefinite life intangible asset			0.0
Carrying value of asset subject to impairment testing	1,200.0		1,200.0
Global Industrial
Changes in the carrying amount of goodwill
Beginning goodwill			4,081.8
Effect of foreign currency translation			14.0
Ending goodwill	4,095.8		4,095.8
Global Institutional and Specialty
Changes in the carrying amount of goodwill
Beginning goodwill			567.6
Current year business combinations			40.5
Effect of foreign currency translation			2.6
Ending goodwill	610.7		610.7
Global Healthcare and Life Sciences
Changes in the carrying amount of goodwill
Beginning goodwill			3,125.4
Effect of foreign currency translation			27.7
Ending goodwill	3,153.1		3,153.1
Other
Changes in the carrying amount of goodwill
Beginning goodwill			237.9
Effect of foreign currency translation			0.9
Ending goodwill	$ 238.8		$ 238.8