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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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