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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 | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Income Tax Disclosure [Abstract] |  |  |  |
Taxable income | $ 75.9 | $ 60.9 | $ 154.2 | $ 125.0
Taxable income, per share (in dollars per share) | $ 0.47 | $ 0.43 | $ 0.97 | $ 0.90
Taxable net realized gains (losses) | $ 3.5 | $ 20.2 | $ 9.4 | $ 27.4
Taxable net realized gains, per share (in dollars per share) | $ 0.02 | $ 0.14 | $ 0.06 | $ 0.20
Weighted average shares outstanding (in shares) | 160,748 | 141,390 | 159,096 | 138,338

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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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