Segments - Reconciliation of Revenue from Segments to Consolidated (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) market Segment	Jun. 30, 2017 USD ($)
Segment Reporting, Revenue Reconciling Item [Line Items]
Number of operating segments | Segment			2
Number of end-markets served | market			4
Net sales	$ 1,206.5	$ 1,088.5	$ 2,372.3	$ 2,096.3
Performance Coatings [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	784.5	662.9	1,513.2	1,249.3
Performance Coatings [Member] | Refinish [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	447.1	421.2	859.7	809.8
Performance Coatings [Member] | Industrial [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	337.4	241.7	653.5	439.5
Transportation Coatings [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	422.0	425.6	859.1	847.0
Transportation Coatings [Member] | Light Vehicle [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	329.4	334.3	678.9	674.3
Transportation Coatings [Member] | Commercial Vehicle [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ 92.6	$ 91.3	$ 180.2	$ 172.7