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Income Taxes (Summary of Tax Loss and Tax Credit Carryforwards) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Tax Credit Carryforward [Line Items] |  |
Deferred tax asset on tax carryforwards | $ 46.1 | $ 48.4
Valuation allowance on tax carryforwards | (43.6) | $ (46.4)
Total |  |
Tax Credit Carryforward [Line Items] |  |
Deferred tax asset on tax carryforwards | 46.1 |
Valuation allowance on tax carryforwards | (43.6) |
Net deferred tax asset on tax carryforwards | 2.5 |
U.S. Federal Tax Credits |  |
Tax Credit Carryforward [Line Items] |  |
2025-2029 | 0.0 |
After 2029 | 9.9 |
Indefinite | 0.0 |
Total tax carryforwards | 9.9 |
Deferred tax asset on tax carryforwards | 9.9 |
Valuation allowance on tax carryforwards | (9.9) |
Net deferred tax asset on tax carryforwards | 0.0 |
U.S. Federal Tax Losses |  |
Tax Credit Carryforward [Line Items] |  |
2025-2029 | 0.0 |
After 2029 | 0.8 |
Indefinite | 0.0 |
Total tax carryforwards | 0.8 |
Deferred tax asset on tax carryforwards | 0.2 |
Valuation allowance on tax carryforwards | (0.1) |
Net deferred tax asset on tax carryforwards | 0.1 |
U.S. State Tax Credits |  |
Tax Credit Carryforward [Line Items] |  |
2025-2029 | 1.1 |
After 2029 | 0.6 |
Indefinite | 0.2 |
Total tax carryforwards | 1.9 |
Deferred tax asset on tax carryforwards | 1.5 |
Valuation allowance on tax carryforwards | (0.7) |
Net deferred tax asset on tax carryforwards | 0.8 |
U.S. State Tax Losses |  |
Tax Credit Carryforward [Line Items] |  |
2025-2029 | 113.2 |
After 2029 | 415.8 |
Indefinite | 4.5 |
Total tax carryforwards | 533.5 |
Deferred tax asset on tax carryforwards | 29.4 |
Valuation allowance on tax carryforwards | (28.8) |
Net deferred tax asset on tax carryforwards | 0.6 |
Non- U.S. Tax Losses |  |
Tax Credit Carryforward [Line Items] |  |
2025-2029 | 0.3 |
After 2029 | 0.3 |
Indefinite | 17.6 |
Total tax carryforwards | 18.2 |
Deferred tax asset on tax carryforwards | 4.3 |
Valuation allowance on tax carryforwards | (4.1) |
Net deferred tax asset on tax carryforwards | 0.2 |
Non US Tax Credits |  |
Tax Credit Carryforward [Line Items] |  |
2025-2029 | 0.0 |
After 2029 | 0.0 |
Indefinite | 0.0 |
Total tax carryforwards | 0.0 |
Deferred tax asset on tax carryforwards | 0.8 |
Valuation allowance on tax carryforwards | 0.0 |
Net deferred tax asset on tax carryforwards | $ 0.8 |

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- Definition The tax effect net of valuation allowance on tax carryforwards as of the balance sheet date of the amount of future tax deductions arising from unused tax credit carryforwards of a nature not otherwise listed in the existing taxonomy. A tax credit carryforward is the amount by which tax credits available for utilization exceeded statutory limits on inclusion in historical filings, and which can only be utilized if sufficient tax-basis income is generated in future periods and providing tax laws continue to allow such utilization. + References No definition available. + Details
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