Supplemental Information - Accrued Expenses (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued interest	$ 13.3	$ 13.6
Accrued taxes	8.2	6.2
Accrued freight	5.5	3.9
Accrued rebates	7.5	6.0
Restructuring reserves (Note 15)	0.5	0.8
Accrued royalties and commissions	1.5	2.5
Currency exchange and natural gas contracts (Note 9)	0.6	0.3
Accrued energy	2.8	2.2
Other	11.8	11.1
Accrued expenses	$ 51.7	$ 46.6