Restructuring and Repositioning Expenses, Asset Impairments - Restructuring Expenses (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Restructuring and Related Activities [Abstract]
Severance and other employee costs	$ 1.9	$ 0.3
Asset impairments	1.0	0.2
Other associated costs	0.2	0.2
Total restructuring expenses and asset impairments	3.1	0.7
Less: restructuring expenses and asset impairments reflected in discontinued operations	0.0	0.1
Total restructuring expenses and asset impairments from continuing operations	$ 3.1	$ 0.6