GOODWILL AND OTHER INTANGIBLE ASSETS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 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
Current year business combinations			38.7
Effect of foreign currency translation			49.9
Ending goodwill	$ 8,101.3		8,101.3
Future estimated amortization expense related to amortizable other identifiable intangible assets
Estimated expense for the remaining six-month period	151.0		151.0
Total amortization expense related to other intangible assets	76.8	$ 78.7	152.4	$ 158.2
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			16.6
Ending goodwill	4,098.4		4,098.4
Global Institutional and Specialty
Changes in the carrying amount of goodwill
Beginning goodwill			567.6
Current year business combinations			38.7
Effect of foreign currency translation			2.7
Ending goodwill	609.0		609.0
Global Healthcare and Life Sciences
Changes in the carrying amount of goodwill
Beginning goodwill			3,125.4
Effect of foreign currency translation			29.6
Ending goodwill	3,155.0		3,155.0
Other
Changes in the carrying amount of goodwill
Beginning goodwill			237.9
Effect of foreign currency translation			1.0
Ending goodwill	$ 238.9		$ 238.9