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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in remainder of current fiscal year.

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Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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Amount of foreign currency translation gain (loss) which increases (decreases) asset representing future economic benefit from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of increase (decrease) from transfer into (out of) asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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GOODWILL AND OTHER INTANGIBLE ASSETS (Details) $ in Millions	3 Months Ended				12 Months Ended
	Mar. 31, 2025 USD ($)	Mar. 31, 2025 USD ($) segment	Mar. 31, 2025 USD ($) item	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)
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	7,907.3
Goodwill revised					$ 7,907.3
Effect of foreign currency translation	(42.8)
Ending goodwill	7,864.5				7,907.3
Number of operating units		7	7
Future estimated amortization expense related to amortizable other identifiable intangible assets
Estimated expense for the remaining nine-month period	218.1	$ 218.1	$ 218.1
Total amortization expense related to other intangible assets	74.9			$ 77.8
Nalco Holding Company ("Nalco") \| Trademarks
Changes in the carrying amount of goodwill
Impairment of indefinite life intangible asset	0.0
Global Institutional and Specialty
Changes in the carrying amount of goodwill
Beginning goodwill	613.2
Goodwill revised					1,024.3
Segment changes/Transferred to held for sale					411.1
Effect of foreign currency translation	(3.1)
Ending goodwill	1,021.2				613.2
Global Life Sciences
Changes in the carrying amount of goodwill
Beginning goodwill	2,819.8
Goodwill revised					2,408.7
Segment changes/Transferred to held for sale					(411.1)
Effect of foreign currency translation	(14.9)
Ending goodwill	2,393.8				2,819.8
Global Pest Elimination
Changes in the carrying amount of goodwill
Beginning goodwill	169.4
Goodwill revised					169.4
Effect of foreign currency translation	(0.4)
Ending goodwill	169.0				169.4
Global Water
Changes in the carrying amount of goodwill
Beginning goodwill	4,304.9
Goodwill revised					4,304.9
Effect of foreign currency translation	(24.4)
Ending goodwill	$ 4,280.5				$ 4,304.9