DIVESTITURES Narrative (Details) R$ in Millions, $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2020 BRL (R$)	Jun. 30, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net (gains) losses on sales and impairments of businesses	$ 8.0		$ 152.0	$ 352.0		$ 145.0
APPM [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cost-method Investments, Realized Gain (Loss), Excluding Other than Temporary Impairments	6.0
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Brazilian Industrial Packaging
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net (gains) losses on sale of assets and impairment charge, net of tax	6.0	$ 337.0
Net (gains) losses on sales and impairments of businesses	8.0	$ 344.0
Estimated proceeds from divestiture of business				$ 60.3	R$ 330
Proceeds to be received at closing | R$					280
Deferred proceeds on disposal of business | R$					R$ 50
Number of containerboard mill to be sold				3	3
Number of box plants to be sold				4	4
Impairment of Long-Lived Assets to be Disposed of	5.0
Impairment of long-lived assets to disposed of, net of tax	3.0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax	$ (3.0)