Income Taxes - Significant Components of the Company's Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred income tax assets:
Postretirement benefit obligation	$ 0.5	$ 1.7
Inventory	8.4	0.8
Net operating loss and credit carryforwards	15.4	16.4
Operating lease liabilities	14.1	15.4
Compensation	3.4	3.9
Disallowed interest	4.9	0.0
Other	5.1	6.4
Total deferred income tax assets	51.8	44.6
Deferred income tax liabilities:
Depreciation and amortization	20.6	20.1
Pension	18.8	16.3
Intangible assets	17.3	16.8
Lease right-of-use assets	14.0	15.2
Other	2.0	3.0
Total deferred income tax liabilities	72.7	71.4
Net deferred income tax liabilities prior to valuation allowances	(20.9)	(26.8)
Valuation allowances	(6.1)	(6.2)
Net deferred income tax liability	$ (27.0)	$ (33.0)