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Income Taxes (Schedule of Unrecognized Tax Benefits Roll Forward) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Disclosure [Abstract] |  |  |
Unrecognized Tax Benefits - Opening Balance | $ 21.7 | $ 21.7 | $ 21.7
Gross decreases - tax positions in prior period | 0.0 | 0.0 | 0.0
Gross increases - current period tax positions | 0.0 | 0.0 | 0.0
Unrecognized Tax Benefits - Ending Balance | 21.7 | 21.7 | 21.7
Offset for net operating loss carryforwards | (21.7) | (21.7) | (21.7)
Balance - Less Net Operating Loss Carryforwards | 0.0 | 0.0 | $ 0.0
Increase (Decrease) in Tax Expense | $ 25.1 | $ 46.8 |

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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-3 + Details
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