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Reportable Segment Information - Reportable Segment Financial Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net sales	$ 4,114.4	$ 4,867.7	$ 4,877.8	$ 4,040.9	$ 4,064.2	$ 4,731.5	$ 4,773.8	$ 3,965.0	$ 17,900.8	$ 17,534.5	$ 14,983.8
Segment profit									2,808.8	2,611.6	2,235.1
California litigation expense adjustment									34.7	(136.3)
Interest expense									(349.3)	(366.7)	(263.5)
Administrative expenses and other									(512.4)	(748.9)	(502.3)
Income before income taxes									1,981.8	1,359.7	1,469.3
Identifiable assets	20,496.2				19,134.3				20,496.2	19,134.3	19,899.5
Capital expenditures									328.9	251.0	222.8
Depreciation									262.1	278.2	285.0
Amortization									312.8	318.1	206.8
Intersegment transfers
Segment Reporting Information [Line Items]
Net sales									3,723.2	3,483.1	3,190.5
Administrative
Segment Reporting Information [Line Items]
Net sales									2.9	3.9	5.7
California litigation expense adjustment									34.7	(136.3)
Interest expense									(349.3)	(366.7)	(263.5)
Administrative expenses and other									(512.4)	(748.9)	(502.3)
Income before income taxes									(827.0)	(1,251.9)	(765.8)
Identifiable assets	1,320.7				1,142.9				1,320.7	1,142.9	1,459.8
Capital expenditures									38.0	25.0	21.7
Depreciation									37.9	39.5	49.2
Amortization									4.8	5.1	6.7
Segment Reconciling
Segment Reporting Information [Line Items]
Net sales									(3,720.3)	(3,479.2)	(3,184.8)
The Americas Group | Operating Segments
Segment Reporting Information [Line Items]
Net sales									10,171.9	9,625.1	9,117.3
Segment profit									2,056.5	1,898.4	1,769.5
Income before income taxes									$ 2,056.5	$ 1,898.4	$ 1,769.5
% to net external sales									20.20%	19.70%	19.40%
Identifiable assets	5,399.1				4,070.9				$ 5,399.1	$ 4,070.9	$ 4,358.9
Capital expenditures									73.3	69.5	69.2
Depreciation									72.2	72.3	75.0
Amortization									4.8	4.8	4.1
The Americas Group | Intersegment transfers
Segment Reporting Information [Line Items]
Net sales										0.5	6.0
The Americas Group | Segment Reconciling
Segment Reporting Information [Line Items]
Net sales									10,171.9	9,625.6	9,123.3
Consumer Brands Group | Operating Segments
Segment Reporting Information [Line Items]
Net sales									2,676.8	2,739.1	2,154.7
Segment profit									373.2	261.1	202.8
Income before income taxes									$ 373.2	$ 261.1	$ 202.8
% to net external sales									13.90%	9.50%	9.40%
Identifiable assets	5,600.8				5,385.3				$ 5,600.8	$ 5,385.3	$ 5,816.0
Capital expenditures									133.4	95.7	95.1
Depreciation									81.1	88.8	91.8
Amortization									90.3	97.5	60.7
Consumer Brands Group | Intersegment transfers
Segment Reporting Information [Line Items]
Net sales									3,607.0	3,460.2	3,162.1
Consumer Brands Group | Segment Reconciling
Segment Reporting Information [Line Items]
Net sales									6,283.8	6,199.3	5,316.8
Performance Coatings Group | Operating Segments
Segment Reporting Information [Line Items]
Net sales									5,049.2	5,166.4	3,706.1
Segment profit									379.1	452.1	262.8
Income before income taxes									$ 379.1	$ 452.1	$ 262.8
% to net external sales									7.50%	8.80%	7.10%
Identifiable assets	$ 8,175.6				$ 8,535.2				$ 8,175.6	$ 8,535.2	$ 8,264.8
Capital expenditures									84.2	60.8	36.8
Depreciation									70.9	77.6	69.0
Amortization									212.9	210.7	135.3
Performance Coatings Group | Intersegment transfers
Segment Reporting Information [Line Items]
Net sales									116.2	22.4	22.4
Performance Coatings Group | Segment Reconciling
Segment Reporting Information [Line Items]
Net sales									$ 5,165.4	$ 5,188.8	$ 3,728.5

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