Unaudited Consolidated Statements of Changes in Net Assets - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2022		Sep. 30, 2021	Sep. 30, 2022		Sep. 30, 2021
Operations
Net investment income (loss)		$ 216.0		$ 201.0	$ 639.0		$ 395.0
Net realized gain (loss) on investments, foreign currency forward contracts, foreign currency and provision for taxes on realized gains on investments		70.0		196.0	232.0		119.0
Net change in unrealized appreciation (depreciation) on investments and foreign currency forward contracts	[1]	(436.0)		(137.0)	(899.0)		792.0
Net change in unrealized gain (loss) on foreign currency		23.0		10.0	53.0		28.0
Net increase (decrease) in net assets resulting from operations		(127.0)		270.0	25.0		1,334.0
Stockholder distributions
Distributions to stockholders	[2]	(190.0)		(186.0)	(562.0)		(335.0)
Net decrease in net assets resulting from stockholder distributions	[2]	(190.0)		(186.0)	(562.0)		(335.0)
Capital share transactions
Issuance of common stock	[3]	0.0		0.0	0.0		3,642.0
Repurchases of common stock	[3]	(10.0)		(1.0)	(33.0)		(1.0)
Net increase (decrease) in net assets resulting from capital share transactions	[3]	(10.0)		(1.0)	(33.0)		3,641.0
Total increase (decrease) in net assets		(327.0)		83.0	(570.0)		4,640.0
Net assets at beginning of period		7,487.0		7,653.0	7,730.0		3,096.0
Net assets at end of period		$ 7,160.0	[4]	$ 7,736.0	$ 7,160.0	[4]	$ 7,736.0

[1] See Note 7 for a discussion of these financial instruments.

[2] See Note 5 for a discussion of the sources of distributions paid by the Company.

[3] See Note 3 for a discussion of the Company’s capital share transactions.

[4] See Note 8 for additional information regarding the fair value of the Company's financial instruments