RESTRUCTURING COSTS - Narrative (Details) - USD ($) $ in Millions	6 Months Ended			12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Oct. 01, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred to date		$ (0.1)
Expected remaining costs		1.0					$ 3.9
Cash expenditures for restructuring		(0.2)	$ (3.9)
Restructuring and related cost, expected cost		7.0
Restructuring liabilities assumed		7.3					9.4
Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred to date		499.4
Expected remaining costs		30.0
Remaining accrual		142.5					223.1
Cash expenditures for restructuring		84.0
Restructuring charges		34.4
Global Integration Activities | Scenario, Forecast
Restructuring Cost and Reserve [Line Items]
Cash expenditures for restructuring				$ 3.0	$ 33.3	$ 106.2
2018 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred to date		77.2
Remaining accrual		27.9					51.5
Cash expenditures for restructuring		31.7
Restructuring charges		10.1
2018 Restructuring | Scenario, Forecast
Restructuring Cost and Reserve [Line Items]
Cash expenditures for restructuring	$ 22.1			0.9	4.9
Other Restructuring 2018 | Scenario, Forecast
Restructuring Cost and Reserve [Line Items]
Cash expenditures for restructuring	$ 2.3			2.5	2.5
Other Restructuring Programs, Assumed Proctor and Gamble Restructuring
Restructuring Cost and Reserve [Line Items]
Remaining accrual		5.4					7.0
Cash expenditures for restructuring		(0.2)	$ 0.0
Restructuring liabilities assumed								$ 21.7
Other Restructuring Programs, Assumed Proctor and Gamble Restructuring | Scenario, Forecast
Restructuring Cost and Reserve [Line Items]
Cash expenditures for restructuring				$ 0.5	$ 2.2	$ 2.7
Other Restructuring | Global Integration Activities
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred to date		10.2
Remaining accrual		2.4					3.1
Cash expenditures for restructuring		2.2
Restructuring charges		1.7
Other Restructuring | 2018 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred to date		4.3
Remaining accrual		2.9					$ 3.3
Cash expenditures for restructuring		1.3
Restructuring charges		$ 0.9