REPORTABLE SEGMENT INFORMATION - Reportable Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Net sales	$ 6,116.7	$ 6,047.4	$ 17,799.7	$ 16,918.4
Segment profit	1,298.8	1,095.3	3,370.5	2,710.8
Interest expense	(101.9)	(101.2)	(322.9)	(282.5)
Administrative expenses and other	(187.9)	(116.9)	(411.7)	(350.1)
Income before income taxes	1,009.0	877.2	2,635.9	2,078.2
Intersegment transfers
Segment Reporting Information [Line Items]
Net sales	(1,408.4)	(1,491.3)	(4,205.3)	(4,164.1)
Administrative
Segment Reporting Information [Line Items]
Net sales	0.6	1.1	2.6	3.2
Administrative and Eliminations
Segment Reporting Information [Line Items]
Net sales	(1,407.8)	(1,490.2)	(4,202.7)	(4,160.9)
Interest expense	(101.9)	(101.2)	(322.9)	(282.5)
Administrative expenses and other	(187.9)	(116.9)	(411.7)	(350.1)
Income before income taxes	(289.8)	(218.1)	(734.6)	(632.6)
Paint Stores Group
Segment Reporting Information [Line Items]
Net sales	3,537.1	3,414.0	9,894.9	9,086.3
Paint Stores Group | Operating Segments
Segment Reporting Information [Line Items]
Net sales	3,537.1	3,414.0	9,894.9	9,086.3
Segment profit	917.5	741.3	2,293.5	1,854.1
Income before income taxes	917.5	741.3	2,293.5	1,854.1
Consumer Brands Group
Segment Reporting Information [Line Items]
Net sales	854.8	890.6	2,673.3	2,642.8
Consumer Brands Group | Intersegment transfers
Segment Reporting Information [Line Items]
Net sales	1,359.1	1,435.6	4,046.2	4,002.8
Consumer Brands Group | Operating Segments
Segment Reporting Information [Line Items]
Net sales	2,213.9	2,326.2	6,719.5	6,645.6
Segment profit	101.6	117.7	305.7	279.1
Income before income taxes	101.6	117.7	305.7	279.1
Performance Coatings Group
Segment Reporting Information [Line Items]
Net sales	1,724.2	1,741.7	5,228.9	5,186.1
Performance Coatings Group | Intersegment transfers
Segment Reporting Information [Line Items]
Net sales	49.3	55.7	159.1	161.3
Performance Coatings Group | Operating Segments
Segment Reporting Information [Line Items]
Net sales	1,773.5	1,797.4	5,388.0	5,347.4
Segment profit	279.7	236.3	771.3	577.6
Income before income taxes	$ 279.7	$ 236.3	$ 771.3	$ 577.6