Restructuring Charges - Changes to Restructuring Liabilities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Restructuring Reserve [Roll Forward]
Charges	$ 8.9	$ 15.3
2020 Restructuring Plan
Restructuring Reserve [Roll Forward]
Restructuring liability, beginning balance	0.7
Charges	9.4
Cash Payments	(2.8)
Other	(5.8)
Restructuring liability, ending balance	1.5
2020 Restructuring Plan | Severance
Restructuring Reserve [Roll Forward]
Restructuring liability, beginning balance	0.7
Charges	4.1
Cash Payments	(2.8)
Other	(0.5)
Restructuring liability, ending balance	1.5
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