Restructuring Activities - Restructuring Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1.4	$ 13.7	$ 1.2	$ 21.5
Cost Transformation
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.9	0.3	2.0	1.5
Organizational Alignment & IT Transformation
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.0	8.1	(0.6)	14.7
Post-Divestiture Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.9	8.4	1.4	16.2
Integration and Restructuring of Business Acquisitions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0.5	$ 5.3	$ (0.2)	$ 5.3