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SIGNIFICANT ACCOUNTING POLICIES - Goodwill and Other Intangible Assets (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 USD ($) item segment | Dec. 31, 2023 USD ($) segment | Dec. 31, 2022 USD ($)
Changes in the carrying amount of goodwill for each of the company's reportable segments |  |  |
Number of reporting units | item | 10 |  |
Number of operating units | segment | 10 | 10 |
Changes in the carrying amount of goodwill |  |  |
Beginning goodwill |  | $ 8,012.7 | $ 8,063.9
Prior year business combinations |  | 0.7 | 253.8
Effect of foreign currency translation |  | 65.4 | (305.0)
Current year business combinations |  | 70.1 |
Ending goodwill |  | 8,148.2 | 8,012.7
Goodwill expected to be tax deductible |  | 62.0 |
Impairment of goodwill |  | 0.0 | 0.0
Nalco Holding Company ("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 |  | 4,081.8 | 4,270.1
Prior year business combinations |  |  | 0.4
Effect of foreign currency translation |  | 28.0 | (188.7)
Current year business combinations |  | 30.8 |
Ending goodwill |  | 4,140.6 | 4,081.8
Global Institutional and Specialty |  |  |
Changes in the carrying amount of goodwill |  |  |
Beginning goodwill |  | 567.6 | 576.5
Effect of foreign currency translation |  | 3.1 | (8.9)
Current year business combinations |  | 39.3 |
Ending goodwill |  | 610.0 | 567.6
Global Healthcare and Life Sciences |  |  |
Changes in the carrying amount of goodwill |  |  |
Beginning goodwill |  | 3,125.4 | 2,974.2
Prior year business combinations |  |  | 253.4
Effect of foreign currency translation |  | 33.0 | (102.2)
Ending goodwill |  | 3,158.4 | 3,125.4
Other |  |  |
Changes in the carrying amount of goodwill |  |  |
Beginning goodwill |  | 237.9 | 243.1
Effect of foreign currency translation |  | 1.3 | (5.2)
Ending goodwill |  | $ 239.2 | $ 237.9

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