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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Deferred Tax Assets, Gross [Abstract] |  |  |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits | $ 2.2 | $ 2.1 |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits | 11.4 | 13.0 |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation | 2.6 | 3.7 |
Deferred Tax Assets, Inventory | 5.2 | 0.9 |
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Pensions | 0.9 | 0.0 |
Deferred Tax Assets, Tax Credit Carryforwards | 9.6 | 8.6 |
Deferred Tax Assets, Operating Loss Carryforwards | 1.0 | 1.4 |
Deferred Tax Asset, In-Process Research and Development | 10.7 | 4.4 |
Deferred tax assets, gross | 52.1 | 42.2 |
Deferred Tax Assets, Valuation Allowance | 8.0 | 7.6 |
Deferred Tax Assets, Net of Valuation Allowance | 44.2 | 34.6 |
Tax position taken in current year | 0.9 | 0.4 | $ 68.6
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 0.0 | (10.4) | (0.1)
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions | 78.4 | 0.0 | $ 0.0
Deferred tax liabilities: |  |  |
Plant and equipment | (124.6) | (59.0) |
Deferred Tax Liabilities, Leasing Arrangements | (6.8) | (7.9) |
Deferred Tax Liabilities, Tax Deferred Expense, Compensation and Benefits Pension and Other Postretirement Benefits | 0.0 | (0.5) |
Intangible assets | 0.0 | (1.3) |
Deferred Tax Liabilities, Other | (0.7) | (1.2) |
Deferred Tax Liabilities, Gross | 132.1 | 69.8 |
Deferred Tax Liabilities, Net | 88.0 | 35.2 |
Lease Agreements [Member] |  |  |
Deferred Tax Assets, Gross [Abstract] |  |  |
Deferred Tax Assets, Other | 6.9 | 8.1 |
Other Expense [Member] |  |  |
Deferred Tax Assets, Gross [Abstract] |  |  |
Deferred Tax Assets, Other | $ 1.7 | $ 0.0 |

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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