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Income Taxes - Carryforwards (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Income taxes |  |
Balance carryforwards, gross value | $ 72.6 | $ 72.0
Balance carryforwards, deferred tax effect | 187.7 | 104.6
Balance carryforwards, valuation allowance | (1.2) | (1.2)
Federal tax jurisdiction |  |
Income taxes |  |
Tax credit carryforwards, gross value | 0.0 | 0.0
Tax credit carryforwards, deferred tax effect | 176.4 | 91.5
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 | 72.6 | 72.0
Tax credit carryforwards, deferred tax effect | 6.8 | 8.7
Operating loss carryforwards, deferred tax effect | 4.5 | 4.4
Tax credit carryforward, valuation allowance | 0.0 | 0.0
Operating loss carryforwards, valuation allowance | $ (1.2) | $ (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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32621-109319 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32621-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32559-109319 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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