REPORTABLE SEGMENT INFORMATION - Reportable Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Net sales	$ 5,122.2	$ 4,867.7	$ 13,872.9	$ 13,786.4
Segment profit	1,101.0	916.0	2,621.0	2,337.1
California litigation expense	0.0	34.7	0.0	34.7
Interest expense	(83.3)	(85.3)	(257.6)	(265.5)
Administrative expenses and other	(142.1)	(155.6)	(348.1)	(421.9)
Income before income taxes	875.6	709.8	2,015.3	1,684.4
Administrative
Segment Reporting Information [Line Items]
Net sales	0.5	0.9	2.1	1.9
California litigation expense		34.7		34.7
Administrative and Eliminations
Segment Reporting Information [Line Items]
Net sales	(1,052.5)	(1,023.8)	(2,872.9)	(2,855.4)
Interest expense	(83.3)	(85.3)	(257.6)	(265.5)
Administrative expenses and other	(142.1)	(155.6)	(348.1)	(421.9)
Income before income taxes	(225.4)	(206.2)	(605.7)	(652.7)
Intersegment transfers
Segment Reporting Information [Line Items]
Net sales	(1,053.0)	(1,024.7)	(2,875.0)	(2,857.3)
The Americas Group
Segment Reporting Information [Line Items]
Net sales	2,978.3	2,898.2	7,807.5	7,809.1
The Americas Group | Operating Segments
Segment Reporting Information [Line Items]
Net sales	2,978.3	2,898.2	7,807.5	7,809.1
Segment profit	747.4	663.6	1,735.4	1,607.1
Income before income taxes	747.4	663.6	1,735.4	1,607.1
Consumer Brands Group
Segment Reporting Information [Line Items]
Net sales	838.1	678.4	2,440.6	2,137.4
Consumer Brands Group | Intersegment transfers
Segment Reporting Information [Line Items]
Net sales	1,024.3	995.2	2,770.0	2,769.0
Consumer Brands Group | Operating Segments
Segment Reporting Information [Line Items]
Net sales	1,862.4	1,673.6	5,210.6	4,906.4
Segment profit	198.3	114.9	519.2	343.5
Income before income taxes	198.3	114.9	519.2	343.5
Performance Coatings Group
Segment Reporting Information [Line Items]
Net sales	1,305.3	1,290.2	3,622.7	3,838.0
Performance Coatings Group | Intersegment transfers
Segment Reporting Information [Line Items]
Net sales	28.7	29.5	105.0	88.3
Performance Coatings Group | Operating Segments
Segment Reporting Information [Line Items]
Net sales	1,334.0	1,319.7	3,727.7	3,926.3
Segment profit	155.3	137.5	366.4	386.5
Income before income taxes	$ 155.3	$ 137.5	$ 366.4	$ 386.5