Restructuring-Related Expenses - Accruals (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		11 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020
Summary of activity for expenses related to the restructuring accruals
Beginning balance			$ 73.3
Expenses	$ 5.2	$ 7.4	15.7	$ 7.4	$ 131.2
Cash payments			(43.7)
Non-cash benefits/(charges)			(1.5)
Ending balance	43.8		43.8		43.8
Productivity and Cost-Savings Initiatives
Summary of activity for expenses related to the restructuring accruals
Beginning balance			71.2
Expenses			3.4		101.4
Cash payments			(32.8)
Non-cash benefits/(charges)			0.1
Ending balance	41.9		41.9		41.9
Facility Relocations and Closures, Consulting, and Other
Summary of activity for expenses related to the restructuring accruals
Beginning balance			2.1
Expenses			12.3		29.8
Cash payments			(10.9)
Non-cash benefits/(charges)			(1.6)
Ending balance	$ 1.9		$ 1.9		$ 1.9