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Income Taxes - Taxable income and Taxable Net Realized Gains Losses (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Income Tax Disclosure [Abstract] |  |  |  |
Taxable income | $ 72.7 | $ 49.1 | $ 197.7 | $ 122.2
Taxable income, per share (in dollars per share) | $ 0.50 | $ 0.39 | $ 1.40 | $ 0.99
Taxable net realized gains (losses) | $ 6.8 | $ (2.0) | $ 34.2 | $ (0.1)
Taxable net realized gains, per share (in dollars per share) | $ 0.04 | $ (0.02) | $ 0.24 | $ 0
Basic weighted average common shares outstanding (in shares) | 146,898,936 | 127,484,391 | 141,222,973 | 123,378,699

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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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