Income Tax Matters - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred income tax assets:
Loss and credit carryforwards	$ 51.5	$ 33.4
Pension Benefits	7.1	4.8
Other assets	29.0	29.4
Leased assets	11.7	7.3
Inventories	50.4	6.9
Valuation allowances	(4.6)	(6.4)
Total deferred income tax assets	145.1	75.4
Deferred income tax liabilities:
Property, plant and equipment	(138.9)	(80.8)
Leased liability	(10.9)	(6.4)
Undistributed foreign earnings	(2.4)	(2.1)
Total deferred income tax liabilities	(152.2)	(89.3)
Net deferred income tax liabilities	$ (7.1)	$ (13.9)