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Income Taxes - Carryforwards (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Income taxes |  |
Balance carryforwards, gross value | $ 62.6 | $ 72.6
Balance carryforwards, deferred tax effect | 160.7 | 187.7
Balance carryforwards, valuation allowance | (5.0) | (1.2)
Federal tax jurisdiction |  |
Income taxes |  |
Tax credit carryforwards, gross value | 0.0 | 0.0
Tax credit carryforwards, deferred tax effect | 153.0 | 176.4
Tax credit carryforward, valuation allowance | 0.0 | 0.0
State and local jurisdiction |  |
Income taxes |  |
Tax credit carryforwards, gross value | 0.0 | 0.0
Operating loss carryforwards, gross value | 62.6 | 72.6
Tax credit carryforwards, deferred tax effect | 3.9 | 6.8
Operating loss carryforwards, deferred tax effect | 3.8 | 4.5
Tax credit carryforward, valuation allowance | (3.9) | 0.0
Operating loss carryforwards, valuation allowance | $ (1.1) | $ (1.2)

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-6 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-8 + Details
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- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible tax credit carryforwards, classified as other. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-6 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-8 Reference 3: 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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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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