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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 | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Income Tax Disclosure [Abstract] |  |  |  |
Taxable income | $ 85.7 | $ 75.8 | $ 230.4 | $ 230.0
Taxable income, per share (in dollars per share) | $ 0.47 | $ 0.47 | $ 1.31 | $ 1.44
Taxable net realized gains (losses) | $ 5.1 | $ 8.7 | $ (30.6) | $ 18.1
Taxable net realized gains (losses) per share (in dollars per share) | $ 0.04 | $ 0.05 | $ (0.17) | $ 0.11
Weighted average shares outstanding (in shares) | 180,360 | 161,019 | 175,633 | 159,742

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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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