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Income Taxes - Tax Effects of Significant Temporary Differences Creating Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Deferred Tax Assets, Gross [Abstract] |  |  |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits | $ 3.6 | $ 3.2 |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits | 13.1 | 12.9 |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation | 3.7 | 3.5 |
Deferred Tax Assets, Inventory | 1.2 | 2.2 |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions | 0.0 | 0.9 |
Deferred Tax Assets, Tax Credit Carryforwards | 10.6 | 10.1 |
Deferred Tax Assets, Operating Loss Carryforwards | 1.3 | 3.3 |
Deferred Tax Assets, in Process Research and Development | 8.0 | 2.7 |
Deferred tax assets, gross | 57.5 | 50.8 |
Deferred Tax Assets, Valuation Allowance | 9.0 | 10.8 |
Deferred Tax Assets, Net of Valuation Allowance | 48.4 | 40.0 |
Tax position taken in current year | 0.4 | 68.6 | $ 0.2
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 10.4 | 0.1 | $ 0.7
Deferred tax liabilities: |  |  |
Plant and equipment | (158.3) | (168.3) |
Deferred Tax Liabilities, Leasing Arrangements | (15.0) | (10.8) |
Deferred Tax Liabilities, Tax Deferred Expense, Compensation and Benefits Pension and Other Postretirement Benefits | (0.5) | 0.0 |
Intangible assets | (1.3) | (1.8) |
Deferred Tax Liabilities, Other | (1.4) | (1.2) |
Deferred Tax Liabilities, Gross | 176.5 | 182.1 |
Deferred Tax Liabilities, Net | 128.1 | 142.1 |
Lease Agreements [Member] |  |  |
Deferred Tax Assets, Gross [Abstract] |  |  |
Deferred Tax Assets, Other | $ 16.0 | $ 12.0 |

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