Operating Segment and Geographic Information - Reconciliation of Segment Data to Financial Statements (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Operating income	$ 22.1	$ 23.8
Corporate costs	(68.1)	(69.0)
Repositioning expenses	(2.7)	(5.4)
Restructuring expenses and asset impairments	(3.1)	(0.6)
Net income attributable to noncontrolling interests	0.1	0.2
Loss from continuing operations before income taxes	(0.4)	(1.6)
Corporate
Segment Reporting Information [Line Items]
Corporate costs	(5.8)	(9.9)
Restructuring expenses and asset impairments	0.0	0.0
Segment Reconciling Items
Segment Reporting Information [Line Items]
Certain pension costs	(1.3)	(1.9)
Shareholder activism and other related costs	(3.6)	(2.5)
COVID-19-related costs	(0.5)	0.0
Repositioning expenses	(2.7)	(5.4)
Restructuring expenses and asset impairments	(3.1)	(0.6)
Third-party and other acquisition-related costs	(0.5)	(0.1)
Net income attributable to noncontrolling interests	0.1	0.2
Interest expense, net	$ (5.1)	$ (5.2)