REPORTABLE SEGMENT INFORMATION - Schedule of Reportable Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Segment Reporting [Line Items]
Net sales	$ 6,789.3	$ 6,314.5	$ 12,456.2	$ 11,620.2
Cost of goods sold	3,451.3	3,196.2	6,337.7	5,942.8
Selling, general and administrative expenses	2,103.7	2,011.6	4,073.3	3,805.4
Interest expense	135.9	112.4	267.5	216.2
Other segment items	(14.1)	8.6	(14.6)	17.1
Income before income taxes	$ 1,112.5	$ 985.7	$ 1,792.3	$ 1,638.7
Percent to Net sales	16.40%	15.60%	14.40%	14.10%
Capital expenditures	$ 108.4	$ 181.5	$ 246.7	$ 370.8
Depreciation	98.5	79.3	196.8	159.2
Amortization	87.9	83.4	176.4	164.4
Identifiable assets	26,951.4	25,363.6	26,951.4	25,363.6	$ 25,901.7
Administrative
Segment Reporting [Line Items]
Net sales	2.0	1.8	4.9	3.5
Intersegment transfers
Segment Reporting [Line Items]
Net sales	(1,571.5)	(1,476.2)	(2,862.2)	(2,702.5)
Administrative and Eliminations
Segment Reporting [Line Items]
Net sales	(1,569.5)	(1,474.4)	(2,857.3)	(2,699.0)
Cost of goods sold	(1,577.7)	(1,486.0)	(2,866.5)	(2,716.0)
Selling, general and administrative expenses	217.1	240.6	386.4	372.2
Interest expense	135.9	112.3	267.5	216.1
Other segment items	(13.5)	(1.2)	(4.8)	1.6
Income before income taxes	(331.3)	(340.1)	(639.9)	(572.9)
Capital expenditures	23.7	50.7	87.9	144.0
Depreciation	16.1	10.6	32.8	17.7
Amortization	0.0	0.2	0.3	0.5
Identifiable assets	3,814.1	3,472.3	3,814.1	3,472.3	3,638.1
Paint Stores Group
Segment Reporting [Line Items]
Net sales	3,890.0	3,702.2	6,939.9	6,642.0
Paint Stores Group | Operating Segments
Segment Reporting [Line Items]
Net sales	3,890.0	3,702.2	6,939.9	6,642.0
Cost of goods sold	1,695.2	1,614.2	3,027.4	2,922.1
Selling, general and administrative expenses	1,237.0	1,173.7	2,394.0	2,266.7
Interest expense	0.0	0.0	0.0	0.0
Other segment items	0.2	(2.2)	2.1	(4.5)
Income before income taxes	$ 957.6	$ 916.5	$ 1,516.4	$ 1,457.7
Percent to Net sales	24.60%	24.80%	21.90%	21.90%
Capital expenditures	$ 25.3	$ 34.7	$ 43.9	$ 61.4
Depreciation	23.0	22.0	46.7	44.1
Amortization	2.8	0.4	4.9	0.8
Identifiable assets	6,846.6	6,446.1	6,846.6	6,446.1	6,378.6
Consumer Brands Group
Segment Reporting [Line Items]
Net sales	983.5	809.4	1,891.8	1,571.6
Consumer Brands Group | Intersegment transfers
Segment Reporting [Line Items]
Net sales	1,555.7	1,467.8	2,833.5	2,688.8
Consumer Brands Group | Operating Segments
Segment Reporting [Line Items]
Net sales	2,539.2	2,277.2	4,725.3	4,260.4
Cost of goods sold	2,075.3	1,886.3	3,811.1	3,519.0
Selling, general and administrative expenses	252.0	219.1	511.3	436.8
Interest expense	0.0	0.1	0.0	0.1
Other segment items	(1.0)	7.5	(7.2)	8.4
Income before income taxes	$ 212.9	$ 164.2	$ 410.1	$ 296.1
Percent to Net sales	21.60%	20.30%	21.70%	18.80%
Capital expenditures	$ 53.7	$ 82.3	$ 105.4	$ 139.2
Depreciation	54.4	42.1	107.3	88.0
Amortization	21.1	17.0	41.8	33.8
Identifiable assets	8,360.9	7,151.8	8,360.9	7,151.8	8,025.5
Performance Coatings Group
Segment Reporting [Line Items]
Net sales	1,913.8	1,801.1	3,619.6	3,403.1
Performance Coatings Group | Intersegment transfers
Segment Reporting [Line Items]
Net sales	15.8	8.4	28.7	13.7
Performance Coatings Group | Operating Segments
Segment Reporting [Line Items]
Net sales	1,929.6	1,809.5	3,648.3	3,416.8
Cost of goods sold	1,258.5	1,181.7	2,365.7	2,217.7
Selling, general and administrative expenses	397.6	378.2	781.6	729.7
Interest expense	0.0	0.0	0.0	0.0
Other segment items	0.2	4.5	(4.7)	11.6
Income before income taxes	$ 273.3	$ 245.1	$ 505.7	$ 457.8
Percent to Net sales	14.30%	13.60%	14.00%	13.50%
Capital expenditures	$ 5.7	$ 13.8	$ 9.5	$ 26.2
Depreciation	5.0	4.6	10.0	9.4
Amortization	64.0	65.8	129.4	129.3
Identifiable assets	$ 7,929.8	$ 8,293.4	$ 7,929.8	$ 8,293.4	$ 7,859.5