RESTRUCTURING INITIATIVES (Charges Reportable by Business Segment) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	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	$ 33.2	$ 117.1
Charges incurred to-date	150.3
Estimated charges to be incurred on approved initiatives	1.0
Total expected charges on approved initiatives	151.3
Open Up Avon | Europe, Middle East & Africa
Restructuring Cost and Reserve [Line Items]
Charges incurred	13.5	32.2
Charges incurred to-date	45.7
Estimated charges to be incurred on approved initiatives	0.1
Total expected charges on approved initiatives	45.8
Open Up Avon | South Latin America
Restructuring Cost and Reserve [Line Items]
Charges incurred	12.7	36.4
Charges incurred to-date	49.1
Estimated charges to be incurred on approved initiatives	0.0
Total expected charges on approved initiatives	49.1
Open Up Avon | North Latin America
Restructuring Cost and Reserve [Line Items]
Charges incurred	2.9	27.9
Charges incurred to-date	30.8
Estimated charges to be incurred on approved initiatives	0.4
Total expected charges on approved initiatives	31.2
Open Up Avon | Asia Pacific
Restructuring Cost and Reserve [Line Items]
Charges incurred	(3.2)	14.4
Charges incurred to-date	11.2
Estimated charges to be incurred on approved initiatives	0.0
Total expected charges on approved initiatives	11.2
Open Up Avon | Global & Other Operating Segments
Restructuring Cost and Reserve [Line Items]
Charges incurred	7.3	6.2
Charges incurred to-date	13.5
Estimated charges to be incurred on approved initiatives	0.5
Total expected charges on approved initiatives	14.0
Transformation Plan
Restructuring Cost and Reserve [Line Items]
Charges incurred	(0.8)	23.7	$ 54.8	$ 74.4	$ 21.4
Charges incurred to-date	173.5
Estimated charges to be incurred on approved initiatives	0.0
Total expected charges on approved initiatives	173.5
Transformation Plan | Europe, Middle East & Africa
Restructuring Cost and Reserve [Line Items]
Charges incurred	(1.1)	5.0	0.9	30.9	0.0
Charges incurred to-date	35.7
Estimated charges to be incurred on approved initiatives	0.0
Total expected charges on approved initiatives	35.7
Transformation Plan | South Latin America
Restructuring Cost and Reserve [Line Items]
Charges incurred	0.0	4.1	5.6	13.2	0.0
Charges incurred to-date	22.9
Estimated charges to be incurred on approved initiatives	0.0
Total expected charges on approved initiatives	22.9
Transformation Plan | North Latin America
Restructuring Cost and Reserve [Line Items]
Charges incurred	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	0.6	(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	0.3	$ 13.4	$ 49.4	$ 16.8	$ 21.4
Charges incurred to-date	101.3
Estimated charges to be incurred on approved initiatives	0.0
Total expected charges on approved initiatives	$ 101.3