Segments - Reconciliation of Revenue from Segments to Consolidated (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) Segment	Mar. 31, 2017 USD ($)
Segment Reporting, Revenue Reconciling Item [Line Items]
Number of operating segments | Segment	2
Net sales	$ 1,165.8	$ 1,007.8
Performance Coatings [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	728.7	586.4
Performance Coatings [Member] | Refinish [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	412.6	388.6
Performance Coatings [Member] | Industrial [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	316.1	197.8
Transportation Coatings [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	437.1	421.4
Transportation Coatings [Member] | Light Vehicle [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	349.5	340.0
Transportation Coatings [Member] | Commercial Vehicle [Member]
Segment Reporting, Revenue Reconciling Item [Line Items]
Net sales	$ 87.6	$ 81.4