Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Assets
Investment owned, cost	$ 14,719.8	$ 15,419.8
Foreign currency, cost	25.0	8.0
Liabilities
Debt financing costs	$ 45.0	$ 36.0
Stockholders’ equity
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	750,000,000	750,000,000
Common stock, shares issued (in shares)	280,066,433	280,066,433
Common stock, shares outstanding (in shares)	280,066,433	280,066,433
Non-controlled/unaffiliated
Assets
Investment owned, cost	$ 9,897.0	$ 11,078.0
Non-controlled/affiliated
Assets
Investment owned, cost	913.0	868.0
Controlled/affiliated
Assets
Investment owned, cost	$ 3,910.0	$ 3,474.0