Restructuring Costs - Summary of Changes in Restructuring Reserve (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 34.0	$ 69.3
Expense	0.8	2.0
Paid/Utilized	(12.4)	(11.9)
Restructuring reserve, ending balance	22.4	59.4
Severance and benefits
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	33.8	68.9
Expense	0.0	0.2
Paid/Utilized	(11.7)	(10.1)
Restructuring reserve, ending balance	22.1	59.0
Plant closing and other
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning balance	0.2	0.4
Expense	0.8	1.8
Paid/Utilized	(0.7)	(1.8)
Restructuring reserve, ending balance	$ 0.3	$ 0.4