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Income Taxes Reconciliation of deferred taxes (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax Disclosure [Abstract] |  |
Accrued liabilities | $ 23.0 | $ 18.0
Pension and post-retirement benefits | 5.0 | 7.0
Share-based compensation | 4.0 | 5.0
Benefit of capital loss and NOL carryovers | 9.0 | 28.0
Other | 12.0 | 8.0
Inventory | 7.0 | 7.0
Market value write down of ARS | 0.0 | 3.0
Deferred Tax Liabilities, Leasing Arrangements | 5.0 | 6.0
Valuation Allowance, Amount | (10.0) | (11.0)
Deferred Tax Assets, Net of Valuation Allowance | 55.0 | 71.0
Deferred Tax Assets, Net | 65.0 | 82.0
Property, plant and equipment | (109.0) | (121.0)
Timber and timberlands | 9.0 | 10.0
Installment sale gain deferral | 7.0 | 6.0
Total Deferred Tax Liabilities | (130.0) | (143.0)
Deferred Tax Liabilities, Net | (75.0) | (72.0)
Long-term deferred tax asset | (3.0) | (1.0)
Long-term deferred tax liability | $ (78.0) | $ (73.0)

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