Restructuring Activities - Restructuring Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ (0.8)	$ 5.8	$ (0.2)	$ 7.8
Post-Divestiture Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.0	5.8	0.5	7.8
Cost Transformation | Post-Divestiture Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.6	1.2	1.1	1.2
Organizational Alignment & IT Transformation | Post-Divestiture Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(0.6)	4.6	(0.6)	6.6
Integration and Restructuring of Business Acquisitions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ (0.8)	$ 0.0	$ (0.7)	$ 0.0