Reportable Segment Information - Narrative (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($) store branch foreign_country	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) store segment branch foreign_country	Dec. 31, 2018 USD ($) store	Dec. 31, 2017 USD ($) store
Segment Reporting Information [Line Items]
Number of reporting segments | segment									3
Number of operating segments | segment									3
Net external 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
Long lived assets | $	15,865.0				14,790.0				15,865.0	14,790.0	15,493.0
Identifiable assets | $	$ 20,496.2				$ 19,134.3				$ 20,496.2	$ 19,134.3	$ 19,899.5
Percent of assets of consolidated foreign subsidiaries to Company's assets	23.60%				25.10%				23.60%	25.10%	26.40%
Non-US
Segment Reporting Information [Line Items]
Net external sales | $									$ 3,679.0	$ 4,028.0	$ 2,960.0
Long lived assets | $	$ 3,211.0				$ 3,290.0				3,211.0	3,290.0	3,691.0
Identifiable assets | $	$ 4,829.0				$ 4,809.0				$ 4,829.0	$ 4,809.0	$ 5,254.0
The Americas Group
Segment Reporting Information [Line Items]
Number of company-operated stores	4,758								4,758
Number of subsidiaries in foreign countries | foreign_country	10								10
Number of net new stores									62	76	101
New stores opened									94
Number of stores closed									32
The Americas Group | United States
Segment Reporting Information [Line Items]
New stores opened									83
Number of stores closed									6
The Americas Group | Canada
Segment Reporting Information [Line Items]
New stores opened									7
The Americas Group | South America
Segment Reporting Information [Line Items]
New stores opened									4
Number of stores closed									17
The Americas Group | Mexico
Segment Reporting Information [Line Items]
Number of stores closed									9
Consumer Brands Group
Segment Reporting Information [Line Items]
Number of subsidiaries in foreign countries | foreign_country	6								6
Percent of sales of one group including intersegment transfers represented products sold through other stores group									57.00%
Performance Coatings Group
Segment Reporting Information [Line Items]
Number of company-operated stores | branch	281								281
Number of subsidiaries in foreign countries | foreign_country	45								45
New stores opened | branch									3
Number of stores closed | branch									4
Net decrease in stores | branch									1