REPORTABLE SEGMENT INFORMATION - Reportable Segment Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Net sales	$ 5,367.3	$ 5,442.4
Segment profit	884.3	839.4
Interest expense	(103.0)	(109.3)
Administrative expenses and other	(141.3)	(115.3)
Income before income taxes	640.0	614.8
Intersegment transfers
Segment Reporting Information [Line Items]
Net sales	(1,248.9)	(1,301.9)
Administrative
Segment Reporting Information [Line Items]
Net sales	1.4	0.8
Administrative and Eliminations
Segment Reporting Information [Line Items]
Net sales	(1,247.5)	(1,301.1)
Interest expense	(103.0)	(109.3)
Administrative expenses and other	(141.3)	(115.3)
Income before income taxes	(244.3)	(224.6)
Paint Stores Group
Segment Reporting Information [Line Items]
Net sales	2,873.0	2,859.1
Paint Stores Group | Operating Segments
Segment Reporting Information [Line Items]
Net sales	2,873.0	2,859.1
Segment profit	493.2	526.7
Income before income taxes	493.2	526.7
Consumer Brands Group
Segment Reporting Information [Line Items]
Net sales	811.0	872.7
Consumer Brands Group | Intersegment transfers
Segment Reporting Information [Line Items]
Net sales	1,211.8	1,253.4
Consumer Brands Group | Operating Segments
Segment Reporting Information [Line Items]
Net sales	2,022.8	2,126.1
Segment profit	153.4	93.8
Income before income taxes	153.4	93.8
Performance Coatings Group
Segment Reporting Information [Line Items]
Net sales	1,681.9	1,709.8
Performance Coatings Group | Intersegment transfers
Segment Reporting Information [Line Items]
Net sales	37.1	48.5
Performance Coatings Group | Operating Segments
Segment Reporting Information [Line Items]
Net sales	1,719.0	1,758.3
Segment profit	237.7	218.9
Income before income taxes	$ 237.7	$ 218.9