Restructuring Activities - Restructuring Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 4.6	$ 1.4	$ 15.9	$ 1.2
Post-Divestiture Restructuring Plan | Post divestiture restructuring plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2.9	0.9	5.5	1.4
Post-Divestiture Restructuring Plan | Integration and restructuring of business acquisitions
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.0	0.5	0.0	(0.2)
Post-Divestiture Restructuring Plan | 2020 Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1.7	$ 0.0	$ 10.4	$ 0.0