Segments - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before income taxes	$ 586.5	$ 534.4	$ 500.1
Interest expense, net	162.6	159.6	147.0
Debt extinguishment and refinancing related costs	0.2	9.5	13.4
Termination benefits and other employee related costs	35.2	81.7	35.2
Strategic review and retention costs	13.4	0.0	0.0
Offering and transactional costs	1.0	1.0	26.1
Loss on divestiture, impairment and deconsolidation	21.1	0.0	77.9
Pension special events	(0.9)	0.0	1.2
Accelerated depreciation	24.3	10.3	6.0
Indemnity (income) losses	(0.4)	4.3	(0.1)
Change in fair value of equity instruments	0.0	0.5	0.0
Step-up inventory	0.0	0.0	3.8
Income before income taxes	330.0	267.5	189.6
Integration related costs			7.7
Non-operational asset impairment charges	0.0	0.0	7.6
Performance Coatings [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before income taxes	449.1	399.5	309.3
Transportation Coatings [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Income before income taxes	$ 137.4	$ 134.9	$ 190.8