Annual report pursuant to Section 13 and 15(d)

Income Taxes - Schedule of Taxable income and Taxable Net Realized Gains Losses (Details)

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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
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]                    
Taxable Income $ 305.0 $ 283.0 $ 181.1              
Taxable Income, Per Share (in dollars per share) $ 1.89 $ 1.96 $ 1.45              
Taxable Net Realized Gains (Losses) $ 34.5 $ (8.2) $ (1.7)              
Taxable Net Realized Gains, Per Share (in dollars per share) $ 0.21 $ (0.06) $ (0.01)              
Basic weighted average common shares outstanding (in shares) 161,082 144,091 125,189 114,742 111,985 101,132 90,929 82,519 73,753 69,479