Fair Value Measurements - Changes in Level 3 Portfolio (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 23,197,844	$ 14,546,560
Purchases of investments	1,461,356	2,254,746
Proceeds from principal repayments and sales of investments	(1,463,798)	(262,145)
Transfers in	10,710	0
Transfers out	(4,289)	(38,097)
Recurring basis, asset, transfers out of level 3	(4,300)
Recurring basis, asset transfers into level 3	10,700
Ending balance	23,013,722	16,587,347
Net change in unrealized appreciation (depreciation) related to financial instruments still held	(221,443)	81,085
Investments \| Accretion of discount/amortization of premium
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Gain (loss) included in earnings	23,509	17,074
Investments \| Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Gain (loss) included in earnings	18,010	(17,390)
Investments \| Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Gain (loss) included in earnings	(229,620)	86,599
First lien debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	22,744,446	14,353,422
Purchases of investments	1,216,113	2,240,791
Proceeds from principal repayments and sales of investments	(1,432,770)	(251,603)
Transfers in	10,710	0
Transfers out	(4,289)	(38,097)
Ending balance	22,351,784	16,389,749
Net change in unrealized appreciation (depreciation) related to financial instruments still held	(215,042)	75,562
First lien debt \| Accretion of discount/amortization of premium
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Gain (loss) included in earnings	22,894	16,878
First lien debt \| Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Gain (loss) included in earnings	17,545	(13,104)
First lien debt \| Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Gain (loss) included in earnings	(222,865)	81,462
Second lien debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	27,881	31,340
Purchases of investments	77	0
Proceeds from principal repayments and sales of investments	0	(4,470)
Transfers in	0	0
Transfers out	0	0
Ending balance	27,742	27,030
Net change in unrealized appreciation (depreciation) related to financial instruments still held	(280)	5,047
Second lien debt \| Accretion of discount/amortization of premium
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Gain (loss) included in earnings	64	8
Second lien debt \| Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Gain (loss) included in earnings	0	(4,874)
Second lien debt \| Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Gain (loss) included in earnings	(280)	5,026
Other secured debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	226,763	68,501
Purchases of investments	33,415	889
Proceeds from principal repayments and sales of investments	(29,442)	(5,416)
Transfers in	0	0
Transfers out	0	0
Ending balance	228,097	64,252
Net change in unrealized appreciation (depreciation) related to financial instruments still held	(3,254)	95
Other secured debt \| Accretion of discount/amortization of premium
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Gain (loss) included in earnings	504	183
Other secured debt \| Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Gain (loss) included in earnings	465	0
Other secured debt \| Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Gain (loss) included in earnings	(3,608)	95
Unsecured debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	46,809	32,826
Purchases of investments	1,626	1,139
Proceeds from principal repayments and sales of investments	0	0
Transfers in	0	0
Transfers out	0	0
Ending balance	48,196	33,757
Net change in unrealized appreciation (depreciation) related to financial instruments still held	(286)	(213)
Unsecured debt \| Accretion of discount/amortization of premium
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Gain (loss) included in earnings	47	5
Unsecured debt \| Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Gain (loss) included in earnings	0	0
Unsecured debt \| Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Gain (loss) included in earnings	(286)	(213)
Structured Finance Investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	29,738
Purchases of investments	760
Proceeds from principal repayments and sales of investments	0
Transfers in	0
Transfers out	0
Ending balance	30,458
Net change in unrealized appreciation (depreciation) related to financial instruments still held	(40)
Structured Finance Investments \| Accretion of discount/amortization of premium
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Gain (loss) included in earnings	0
Structured Finance Investments \| Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Gain (loss) included in earnings	0
Structured Finance Investments \| Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Gain (loss) included in earnings	(40)
Equity investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	122,207	60,471
Purchases of investments	209,365	11,927
Proceeds from principal repayments and sales of investments	(1,586)	(656)
Transfers in	0	0
Transfers out	0	0
Ending balance	327,445	72,559
Net change in unrealized appreciation (depreciation) related to financial instruments still held	(2,541)	594
Equity investments \| Accretion of discount/amortization of premium
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Gain (loss) included in earnings	0	0
Equity investments \| Net realized gain (loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Gain (loss) included in earnings	0	588
Equity investments \| Net change in unrealized appreciation (depreciation)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Gain (loss) included in earnings	$ (2,541)	$ 229

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales and Settlements

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Fair Value, Measurement with Unobservable Outputs Reconciliation, Recurring Basis, Asset, Transfers Out

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Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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