Property, Plant, and Equipment - Severance Liability (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Severance liability at January 1	$ 0.7	$ 2.1	$ 15.7
Severance expense	4.6	0.0	0.0
Severance payments	(0.4)	(0.1)	(7.2)
Other	0.0	(1.3)	(6.4)
Severance liability at December 31	$ 4.9	$ 0.7	$ 2.1