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SIGNIFICANT ACCOUNTING POLICIES - Goodwill and Other Intangible Assets (Details) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2020 USD ($) item	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Changes in the carrying amount of goodwill for each of the company's reportable segments
Number of reporting units | item	11
Changes in the carrying amount of goodwill
Beginning goodwill		$ 5,569.1	$ 5,394.1
Current year business combinations		275.7	235.0
Prior year business combinations		0.6	(0.2)
Dispositions		(47.6)
Effect of foreign currency translation		209.1	(59.8)
Ending goodwill		6,006.9	5,569.1	$ 5,394.1
Impairment of goodwill		0.0
Goodwill expected to be tax deductible			49.4
Previously Reported
Changes in the carrying amount of goodwill
Beginning goodwill			5,394.1
Ending goodwill				5,394.1
Nalco | Trademarks
Changes in the carrying amount of goodwill
Carrying value of asset subject to impairment testing	$ 1,200.0
Impairment of indefinite life intangible asset		0.0
Global Industrial
Changes in the carrying amount of goodwill
Beginning goodwill		3,923.7	3,961.6
Segment changes				1,230.8
Current year business combinations		275.7
Prior year business combinations			(0.2)
Dispositions		(47.6)
Effect of foreign currency translation		136.1	(37.7)
Ending goodwill		4,287.9	3,923.7	3,961.6
Global Industrial | Previously Reported
Changes in the carrying amount of goodwill
Beginning goodwill			2,730.8
Ending goodwill				2,730.8
Global Institutional & Specialty
Changes in the carrying amount of goodwill
Beginning goodwill		548.2	417.8
Segment changes				(597.5)
Current year business combinations			135.3
Effect of foreign currency translation		15.9	(4.9)
Ending goodwill		564.1	548.2	417.8
Global Institutional & Specialty | Previously Reported
Changes in the carrying amount of goodwill
Beginning goodwill			1,015.3
Ending goodwill				1,015.3
Global Healthcare and Life Sciences
Changes in the carrying amount of goodwill
Beginning goodwill		859.4	775.3
Segment changes				775.3
Current year business combinations			99.0
Prior year business combinations		0.6
Effect of foreign currency translation		49.8	(14.9)
Ending goodwill		909.8	859.4	775.3
Global Energy
Changes in the carrying amount of goodwill
Segment changes				(1,442.7)
Global Energy | Previously Reported
Changes in the carrying amount of goodwill
Beginning goodwill			1,442.7
Ending goodwill				1,442.7
Other
Changes in the carrying amount of goodwill
Beginning goodwill		237.8	239.4
Segment changes				34.1
Current year business combinations			0.7
Effect of foreign currency translation		7.3	(2.3)
Ending goodwill		$ 245.1	237.8	239.4
Other | Previously Reported
Changes in the carrying amount of goodwill
Beginning goodwill			$ 205.3
Ending goodwill				$ 205.3

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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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