DISCONTINUED OPERATIONS - Narrative (Details) R$ in Millions, $ in Millions						9 Months Ended		12 Months Ended
	Apr. 20, 2022 USD ($)	Aug. 20, 2021 USD ($)	Jul. 01, 2021 USD ($)	Jun. 28, 2021 BRL (R$)	May 04, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Apr. 07, 2022 USD ($)	Mar. 23, 2021 BRL (R$)	Dec. 31, 2020 BRL (R$)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of businesses						$ 348.6	$ 0.0	$ 61.2	$ 348.6	$ 0.0
Goodwill						57.8		56.4	$ 57.8
Fermavi
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Potential proceeds from sale of investments		$ 2.9		R$ 45.0
Deferred purchase price | R$				R$ 30.0
Discounted deferred proceeds receivable		$ 4.8
North America Micronutrient Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net loss on adjustment to fair value less estimated costs to sell						30.6
Specialty Plant Nutrition Bussines
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain on sale of business			$ 323.1
Reporting unit (as a percent)										84.00%			84.00%
Total reporting unit allocation at closing										$ 189.7			R$ 951.6
Chemicals Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net loss on adjustment to fair value less estimated costs to sell						90.2
Adjustment to fair value less cost to sell						52.9
Discontinued Operations, Held-for-sale or Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain on sale of business						30.6		0.0		0.0
Release of accumulated currency translation adjustment						9.9		17.5		(4.2)
Net loss on adjustment to fair value less estimated costs to sell						$ 209.8		$ 0.0		0.0
Discontinued Operations, Held-for-sale or Disposed of by Sale | Plant Nutrition, South America
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross proceeds received			421.1
Working capital adjustments			6.2
Selling costs			8.4
Proceeds from sale of businesses			318.4
Debt assumed by ICL Brasil			$ 102.7
Additional earn out payment											$ 18.5	R$ 88.0
Discontinued Operations, Held-for-sale or Disposed of by Sale | North America Micronutrient Assets
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross proceeds received					$ 56.7
Selling costs					0.5
Net gain on sale of business					30.6
Release of accumulated currency translation adjustment					$ 2.8
Goodwill										$ 6.8
Discontinued Operations, Held-for-sale or Disposed of by Sale | South America Chemicals Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gross proceeds received	$ 51.5
Selling costs	2.4
Net gain on sale of business	23.1
Release of accumulated currency translation adjustment	49.5
Cash on hand	$ 6.4