RESTRUCTURING INITIATIVES (Charges Reportable by Business Segment) (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Open Up Avon
Restructuring Cost and Reserve [Line Items]
Charges incurred	$ 1.7	$ 25.2	$ 33.2	$ 117.1
Charges incurred to-date	177.2
Estimated charges to be incurred on approved initiatives	1.7
Total expected charges on approved initiatives	178.9
Open Up Avon | Europe, Middle East & Africa
Restructuring Cost and Reserve [Line Items]
Charges incurred	(0.8)	4.5	13.5	32.2
Charges incurred to-date	49.4
Estimated charges to be incurred on approved initiatives	1.7
Total expected charges on approved initiatives	51.1
Open Up Avon | South Latin America
Restructuring Cost and Reserve [Line Items]
Charges incurred	1.6	13.7	12.7	36.4
Charges incurred to-date	64.4
Estimated charges to be incurred on approved initiatives
Total expected charges on approved initiatives	64.4
Open Up Avon | North Latin America
Restructuring Cost and Reserve [Line Items]
Charges incurred	0.4	4.3	2.9	27.9
Charges incurred to-date	35.5
Estimated charges to be incurred on approved initiatives
Total expected charges on approved initiatives	35.5
Open Up Avon | Asia Pacific
Restructuring Cost and Reserve [Line Items]
Charges incurred	0.4	(1.2)	(3.2)	14.4
Charges incurred to-date	10.4
Estimated charges to be incurred on approved initiatives
Total expected charges on approved initiatives	10.4
Open Up Avon | Global & Other Operating Segments
Restructuring Cost and Reserve [Line Items]
Charges incurred	0.1	3.9	7.3	6.2
Charges incurred to-date	17.5
Estimated charges to be incurred on approved initiatives
Total expected charges on approved initiatives	17.5
Transformation Plan
Restructuring Cost and Reserve [Line Items]
Charges incurred	0.5	0.0	(0.8)	23.7	$ 54.8	$ 74.4	$ 21.4
Charges incurred to-date	174.0
Estimated charges to be incurred on approved initiatives	0.0
Total expected charges on approved initiatives	174.0
Transformation Plan | Europe, Middle East & Africa
Restructuring Cost and Reserve [Line Items]
Charges incurred	(0.1)	0.0	(1.1)	5.0	0.9	30.9	0.0
Charges incurred to-date	35.6
Estimated charges to be incurred on approved initiatives	0.0
Total expected charges on approved initiatives	35.6
Transformation Plan | South Latin America
Restructuring Cost and Reserve [Line Items]
Charges incurred	0.5	0.0	0.0	4.1	5.6	13.2	0.0
Charges incurred to-date	23.4
Estimated charges to be incurred on approved initiatives	0.0
Total expected charges on approved initiatives	23.4
Transformation Plan | North Latin America
Restructuring Cost and Reserve [Line Items]
Charges incurred	0.0	0.0	0.0	0.6	(0.6)	4.4	0.0
Charges incurred to-date	4.4
Estimated charges to be incurred on approved initiatives	0.0
Total expected charges on approved initiatives	4.4
Transformation Plan | Asia Pacific
Restructuring Cost and Reserve [Line Items]
Charges incurred	0.0	0.0	0.0	0.6	(0.5)	9.1	0.0
Charges incurred to-date	9.2
Estimated charges to be incurred on approved initiatives	0.0
Total expected charges on approved initiatives	9.2
Transformation Plan | Global & Other Operating Segments
Restructuring Cost and Reserve [Line Items]
Charges incurred	0.1	$ 0.0	$ 0.3	$ 13.4	$ 49.4	$ 16.8	$ 21.4
Charges incurred to-date	101.4
Estimated charges to be incurred on approved initiatives	0.0
Total expected charges on approved initiatives	$ 101.4