Restructuring Costs - Summary of Changes in Restructuring Reserve (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			$ 34.0	$ 69.3
Expense	$ 0.8	$ 1.1	1.6	3.1
Paid/Utilized			(15.0)	(19.4)
Restructuring reserve, ending balance	20.6	53.0	20.6	53.0
Severance and benefits
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			33.8	68.9
Expense			0.1	(0.4)
Paid/Utilized			(13.5)	(15.8)
Restructuring reserve, ending balance	20.4	52.7	20.4	52.7
Plant closing and other
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance			0.2	0.4
Expense			1.5	3.5
Paid/Utilized			(1.5)	(3.6)
Restructuring reserve, ending balance	$ 0.2	$ 0.3	$ 0.2	$ 0.3