Restructuring Charges - Changes to Restructuring Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring Reserve [Roll Forward]
Charges	$ 1.2	$ (1.1)	$ 14.9	$ 35.6
2020 Restructuring Plan
Restructuring Reserve [Roll Forward]
Restructuring liability, beginning balance			0.7
Charges			14.9
Cash Payments			(7.0)
Other			(5.3)
Restructuring liability, ending balance	3.3		3.3
2020 Restructuring Plan | Severance
Restructuring Reserve [Roll Forward]
Restructuring liability, beginning balance			0.7
Charges	1.2		9.6
Cash Payments			(7.0)
Other			0.0
Restructuring liability, ending balance	3.3		3.3
2020 Restructuring Plan | Other Restructuring
Restructuring Reserve [Roll Forward]
Restructuring liability, beginning balance			0.0
Charges			5.3
Cash Payments			0.0
Other			(5.3)
Restructuring liability, ending balance	$ 0.0		$ 0.0