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Income Taxes - Tax Effects of Significant Temporary Differences Creating Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred Tax Assets, Gross [Abstract] |  |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits | $ 3.4 | $ 3.8
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits | 19.2 | 17.1
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation | 5.2 | 4.4
Deferred Tax Assets, Inventory | 0.6 | 7.6
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions | 0.2 | 3.2
Deferred Tax Assets, Tax Credit Carryforwards | 16.2 | 10.3
Deferred Tax Assets, Operating Loss Carryforwards | 3.9 | 8.8
Deferred tax assets, gross | 68.5 | 89.7
Deferred Tax Assets, Valuation Allowance | 5.4 | 5.3
Deferred Tax Assets, Net of Valuation Allowance | 63.1 | 84.4
Deferred tax liabilities: |  |
Plant and equipment | (199.7) | (179.2)
Deferred Tax Liabilities, Leasing Arrangements | (16.4) | (18.9)
Intangible assets | (3.0) | (3.8)
Deferred Tax Liabilities, Gross | 219.1 | 201.9
Deferred Tax Liabilities, Net | 156.0 | 117.5
Interest Expense [Member] |  |
Deferred Tax Assets, Gross [Abstract] |  |
Deferred Tax Assets, Tax Deferred Expense, Other | 0.0 | 12.4
Lease Agreements [Member] |  |
Deferred Tax Assets, Gross [Abstract] |  |
Deferred Tax Assets, Other | 18.0 | 20.5
Other Expense [Member] |  |
Deferred Tax Assets, Gross [Abstract] |  |
Deferred Tax Assets, Other | $ 1.8 | $ 1.6

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