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Income Taxes - Schedule of Aggregate Unrealized Appreciation of Company investment Federal Income Tax (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Income Tax Disclosure [Abstract] |  |  |
Tax basis of investments, gross, unrealized appreciation | $ 118.3 | $ 72.2 | $ 121.0
Tax basis of investments, gross, unrealized depreciation | 115.9 | 112.0 | 75.7
Tax basis of investments, unrealized appreciation (depreciation), net | 2.4 | (39.8) | 45.3
Tax basis of investments, cost for income tax purposes | $ 3,200.0 | $ 3,000.0 | $ 2,400.0

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- Definition Amount of cost of investment for federal income tax purpose. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(h)(2)(iv)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479886/946-10-S99-3 + Details
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- Definition Amount of cumulative increase in investment from unrealized gain when value exceeds cost for federal income tax purpose. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(h)(2)(i)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479886/946-10-S99-3 + Details
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- Definition Amount of cumulative decrease in investment from unrealized loss when cost for federal income tax purpose exceeds value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(h)(2)(ii)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479886/946-10-S99-3 + Details
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