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SIGNIFICANT ACCOUNTING POLICIES - Goodwill and Other Intangible Assets (Details) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2022 USD ($) item	Jun. 30, 2022 USD ($) segment	Dec. 31, 2022 USD ($) segment	Dec. 31, 2021 USD ($)
Changes in the carrying amount of goodwill for each of the company's reportable segments
Number of reporting units \| item	12
Number of operating units \| segment		11	11
Changes in the carrying amount of goodwill
Beginning goodwill		$ 8,063.9	$ 8,063.9	$ 6,006.9
Current year business combinations				2,147.3
Prior year business combinations			253.8	(0.9)
Effect of foreign currency translation			(305.0)	(89.4)
Ending goodwill			8,012.7	8,063.9
Impairment of goodwill			0.0	0.0
Goodwill expected to be tax deductible				2,209.0
Nalco Holding Company ("Nalco") \| Trademarks
Changes in the carrying amount of goodwill
Carrying value of asset subject to impairment testing	$ 1,200.0	1,200.0
Impairment of indefinite life intangible asset			0.0
Global Industrial
Changes in the carrying amount of goodwill
Beginning goodwill		4,270.1	4,270.1	4,287.9
Current year business combinations				6.9
Prior year business combinations			0.4	(0.9)
Effect of foreign currency translation			(188.7)	(23.8)
Ending goodwill			4,081.8	4,270.1
Global Institutional and Specialty
Changes in the carrying amount of goodwill
Beginning goodwill		576.5	576.5	564.1
Current year business combinations				17.2
Effect of foreign currency translation			(8.9)	(4.8)
Ending goodwill			567.6	576.5
Global Healthcare and Life Sciences
Changes in the carrying amount of goodwill
Beginning goodwill		2,974.2	2,974.2	909.8
Current year business combinations				2,123.2
Prior year business combinations			253.4
Effect of foreign currency translation			(102.2)	(58.8)
Ending goodwill			3,125.4	2,974.2
Other
Changes in the carrying amount of goodwill
Beginning goodwill		$ 243.1	243.1	245.1
Effect of foreign currency translation			(5.2)	(2.0)
Ending goodwill			$ 237.9	$ 243.1