Supplemental Balance Sheet Data - Inventories (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Inventories by major class:
Raw materials	$ 52.0	$ 54.7
Work in progress	43.2	32.6
Finished goods	67.2	64.0
Supplies and other	4.4	3.8
Inventories, gross	166.8	155.1
Excess of FIFO over LIFO cost	(18.5)	(16.6)
Total	$ 148.3	$ 138.5