Consolidated Statements of Operations - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Investment income
Paid-in-kind interest income		$ 120.0		$ 111.0		$ 84.0
Total investment income		1,635.0		1,081.0		639.0
Operating expenses
Management fees		245.0		173.0		106.0
Subordinated income incentive fees	[1]	159.0		77.0		0.0
Administrative services expenses		15.0		12.0		7.0
Accounting and administrative fees		5.0		3.0		2.0
Interest expense	[2]	365.0		231.0		170.0
Other general and administrative expenses		22.0		19.0		13.0
Total operating expenses		811.0		515.0		298.0
Incentive fee waiver	[1]	(60.0)		(30.0)		0.0
Net expenses		751.0		485.0		298.0
Net investment income before taxes		884.0		596.0		341.0
Excise taxes		19.0		12.0		10.0
Net investment income		865.0		584.0		331.0
Realized and unrealized gain/loss
Net realized gain (loss) on investments:		149.0		171.0		(490.0)
Net realized gain (loss) on foreign currency forward contracts		10.0		0.0		0.0
Net change in unrealized appreciation (depreciation) on investments:	[3]	(981.0)		717.0		(221.0)
Net change in unrealized appreciation (depreciation) on foreign currency forward contracts		16.0		12.0		(3.0)
Net change in unrealized gain (loss) on foreign currency		15.0		30.0		(16.0)
Total net realized and unrealized gain (loss)		(768.0)		934.0		(736.0)
Provision for taxes on realized and unrealized gains on investments		(5.0)		0.0		0.0
Realized loss on extinguishment of debt		0.0		(3.0)		0.0
Net increase (decrease) in net assets resulting from operations		92.0		$ 1,515.0		$ (405.0)
Earnings Per Share [Abstract]
Net increase (decrease) in net assets resulting from operations (Earnings per Share) - basic (in dollars per share)				$ 0.32		$ 7.16
Net increase (decrease) in net assets resulting from operations (Earnings per Share) - diluted (in dollars per share)				$ 0.32		$ 7.16
Weighted average shares outstanding - basic (in shares)				283,508,494		211,670,361
Weighted average shares outstanding - diluted (in shares)				283,508,494		211,670,361
Non-controlled/unaffiliated
Investment income
Interest income		1,020.0		$ 641.0		$ 427.0
Paid-in-kind interest income		72.0		52.0		43.0
Fee income		74.0		88.0		33.0
Dividend and other income		50.0		30.0		16.0
Realized and unrealized gain/loss
Net realized gain (loss) on investments:		136.0		28.0		(323.0)
Net realized gain (loss) on foreign currency		23.0		(7.0)		(6.0)
Net change in unrealized appreciation (depreciation) on investments:		(679.0)		478.0		17.0
Non-controlled/affiliated
Investment income
Interest income		28.0		21.0		10.0
Paid-in-kind interest income		48.2	[4]	18.5	[5]	19.0
Fee income		5.6	[4]	1.9	[5]	0.0
Dividend and other income		6.5	[4]	0.4	[5]	0.0
Realized and unrealized gain/loss
Net realized gain (loss) on investments:		83.6		191.9		(132.0)
Net change in unrealized appreciation (depreciation) on investments:		(131.4)		94.3		(126.0)
Controlled/affiliated
Investment income
Interest income		58.0		25.0		7.0
Paid-in-kind interest income		43.1	[6]	35.9	[7]	4.0
Fee income		0.0	[6]	0.6	[7]	0.0
Dividend and other income		228.7	[6]	165.7	[7]	80.0
Realized and unrealized gain/loss
Net realized gain (loss) on investments:		(71.4)		(48.5)		(35.0)
Net change in unrealized appreciation (depreciation) on investments:		$ (171.1)		$ 156.5		$ (112.0)

[1] See Note 2 and 4 for a discussion of the methodology employed by the Company in calculating the subordinated income incentive fees.

[2] See Note 9 for a discussion of the Company’s financing arrangements.

[3] For the year ended December 31, 2021, amount excludes $11 of unrealized depreciation on unfunded commitments acquired from the 2021 Merger.

[4] Interest, PIK, fee and dividend and other income presented for the full year ended December 31, 2022.

[5] Interest, PIK, fee and dividend income presented for the full year ended December 31, 2021.

[6] Interest, PIK, fee and dividend and other income presented for the full year ended December 31, 2022.

[7] Interest, PIK, fee and dividend income presented for the full year ended December 31, 2021.