Restructuring-Related Expenses - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		11 Months Ended	24 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Dec. 31, 2020
Restructuring-Related Expenses
Restructuring-related expenses and business transformation expenses	$ 5.2	$ 7.4	$ 15.7	$ 7.4	$ 131.2
Productivity and Cost-Savings Initiatives
Restructuring-Related Expenses
Restructuring-related expenses and business transformation expenses			3.4		101.4
Facility Relocations and Closures, Consulting, and Other
Restructuring-Related Expenses
Restructuring-related expenses and business transformation expenses			$ 12.3		$ 29.8
Forecast
Restructuring-Related Expenses
Restructuring-related expenses and business transformation expenses						$ 150.0
Forecast | Productivity and Cost-Savings Initiatives
Restructuring-Related Expenses
Restructuring-related expenses and business transformation expenses						110.0
Forecast | Facility Relocations and Closures, Consulting, and Other
Restructuring-Related Expenses
Restructuring-related expenses and business transformation expenses						$ 40.0