Restructuring Charges - Changes to Restructuring Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Reserve [Roll Forward]
Charges	$ 4.8	$ 21.4	$ 13.7	$ 36.7
2020 Restructuring Plan
Restructuring Reserve [Roll Forward]
Restructuring liability, beginning balance			0.7
Charges			14.2
Cash Payments			(4.2)
Other			(5.8)
Restructuring liability, ending balance	4.9		4.9
2020 Restructuring Plan | Severance
Restructuring Reserve [Roll Forward]
Restructuring liability, beginning balance			0.7
Charges	4.8		8.9
Cash Payments			(4.2)
Other			(0.5)
Restructuring liability, ending balance	4.9		4.9
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