Income Taxes Reconciliation of deferred taxes (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Accrued liabilities	$ 21.0	$ 20.0
Deferred Tax Assets, Deferred Expense, Capitalized Research and Development Costs	19.0	14.0
Benefit of capital loss and NOL carryovers	10.0	6.0
Operating lease liabilities	8.0	7.0
Other	11.0	15.0
Inventory	14.0	9.0
Deferred Tax Liabilities, Leasing Arrangements	8.0	7.0
Deferred Tax Liabilities, Investments	7.0	7.0
Deferred Revenue	3.0	3.0
Valuation Allowance, Amount	(4.0)	(4.0)
Deferred Tax Assets, Net of Valuation Allowance	82.0	70.0
Deferred Tax Assets, Net	86.0	74.0
Property, plant and equipment	(188.0)	(152.0)
Deferred Tax Liabilities, Undistributed Foreign Earnings	21.0	0.0
Timber and timberlands	6.0	7.0
Installment sale gain deferral	(4.0)	(3.0)
Total Deferred Tax Liabilities	(234.0)	(176.0)
Deferred Tax Liabilities, Net, Total	152.0	106.0
Long-term deferred tax asset	(11.0)	(7.0)
Long-term deferred tax liability	$ (162.0)	$ (113.0)