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Income Taxes - Schedule of Taxable income and Taxable Net Realized Gains Losses (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |  |  |
Taxable Income | $ 283.0 | $ 181.1 | $ 172.8 |  |
Taxable income, per share (in dollars per share) | $ 1.96 | $ 1.45 | $ 1.51 |  |
Taxable Net Realized Gains (Losses) | $ (8.2) | $ (1.7) | $ 89.4 |  |
Taxable net realized gains, per share (in dollars per share) | $ (0.06) | $ (0.01) | $ 0.78 |  |
Basic weighted average common shares outstanding (in shares) | 144,091 | 125,189 | 114,742 | 111,985 | 101,132

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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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