Segments - Reconciliation of Revenue from Segments to Consolidated (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) Segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting, Revenue Reconciling Item [Line Items]
Number of operating segments | Segment		2
Net sales		$ 4,482,200,000	$ 4,696,000,000.0	$ 4,377,000,000.0
Equity in earnings (losses) in unconsolidated affiliates		300,000	300,000	1,000,000.0
Investment in unconsolidated affiliates		15,100,000	15,400,000	15,500,000
Intercompany sales between segments	$ 0
Performance Coatings [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales		2,923,400,000	3,033,100,000	2,683,300,000
Equity in earnings (losses) in unconsolidated affiliates		400,000	400,000	300,000
Investment in unconsolidated affiliates		2,400,000	2,700,000	2,900,000
Performance Coatings [Member] | Refinish [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales		1,760,400,000	1,759,600,000	1,651,600,000
Performance Coatings [Member] | Industrial [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales		1,163,000,000.0	1,273,500,000	1,031,700,000
Transportation Coatings [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales		1,558,800,000	1,662,900,000	1,693,700,000
Equity in earnings (losses) in unconsolidated affiliates		(100,000)	(100,000)	700,000
Investment in unconsolidated affiliates		12,700,000	12,700,000	12,600,000
Transportation Coatings [Member] | Light Vehicle [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales		1,208,400,000	1,307,200,000	1,337,100,000
Transportation Coatings [Member] | Commercial Vehicle [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales		$ 350,400,000	$ 355,700,000	$ 356,600,000