RESTRUCTURING INITIATIVES (Charges Reportable by Business Segment) (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Transformation Plan
Restructuring Cost and Reserve [Line Items]
Charges incurred	$ (3.7)	$ 18.9	$ 9.1	$ 54.8	$ 74.4	$ 21.4
Charges incurred to-date	174.9
Estimated charges to be incurred on approved initiatives	6.1
Total expected charges on approved initiatives	181.0
Transformation Plan | Europe, Middle East & Africa
Restructuring Cost and Reserve [Line Items]
Charges incurred	0.2	4.7	3.2	0.9	30.9	0.0
Charges incurred to-date	39.9
Estimated charges to be incurred on approved initiatives	0.6
Total expected charges on approved initiatives	40.5
Transformation Plan | South Latin America
Restructuring Cost and Reserve [Line Items]
Charges incurred	(0.1)	(0.1)	5.3	5.6	13.2	0.0
Charges incurred to-date	23.9
Estimated charges to be incurred on approved initiatives	0.0
Total expected charges on approved initiatives	23.9
Transformation Plan | North Latin America
Restructuring Cost and Reserve [Line Items]
Charges incurred	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	(0.5)	9.1	0.0
Charges incurred to-date	8.6
Estimated charges to be incurred on approved initiatives	0.0
Total expected charges on approved initiatives	8.6
Transformation Plan | Global & Other Operating Segments
Restructuring Cost and Reserve [Line Items]
Charges incurred	(3.8)	$ 14.3	$ 0.0	$ 49.4	$ 16.8	$ 21.4
Charges incurred to-date	98.1
Estimated charges to be incurred on approved initiatives	5.5
Total expected charges on approved initiatives	103.6
Open Up Avon
Restructuring Cost and Reserve [Line Items]
Charges incurred	10.8
Charges incurred to-date	10.8
Estimated charges to be incurred on approved initiatives	0.0
Total expected charges on approved initiatives	10.8
Open Up Avon | Europe, Middle East & Africa
Restructuring Cost and Reserve [Line Items]
Charges incurred	1.3
Charges incurred to-date	1.3
Estimated charges to be incurred on approved initiatives	0.0
Total expected charges on approved initiatives	1.3
Open Up Avon | South Latin America
Restructuring Cost and Reserve [Line Items]
Charges incurred	4.3
Charges incurred to-date	4.3
Estimated charges to be incurred on approved initiatives	0.0
Total expected charges on approved initiatives	4.3
Open Up Avon | North Latin America
Restructuring Cost and Reserve [Line Items]
Charges incurred	2.1
Charges incurred to-date	2.1
Estimated charges to be incurred on approved initiatives	0.0
Total expected charges on approved initiatives	2.1
Open Up Avon | Asia Pacific
Restructuring Cost and Reserve [Line Items]
Charges incurred	0.0
Charges incurred to-date	0.0
Estimated charges to be incurred on approved initiatives	0.0
Total expected charges on approved initiatives	0.0
Open Up Avon | Global & Other Operating Segments
Restructuring Cost and Reserve [Line Items]
Charges incurred	3.1
Charges incurred to-date	3.1
Estimated charges to be incurred on approved initiatives	0.0
Total expected charges on approved initiatives	$ 3.1