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Income Taxes - Taxable income and Taxable Net Realized Gains Losses (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Income Tax Disclosure [Abstract] |  |
Taxable income | $ 78.3 | $ 64.1
Taxable income, per share (in dollars per share) | $ 0.50 | $ 0.47
Taxable net realized gains (losses) | $ 5.9 | $ 7.2
Taxable net realized gains, per share (in dollars per share) | $ 0.04 | $ 0.05
Basic weighted average common shares outstanding (in shares) | 157,445 | 135,252

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482689/260-10-45-10 + Details
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