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Disclosure - Derivatives - Schedule of Average Outstanding Daily Volume for Forward Currency Contracts (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Derivatives - Schedule of Interest Rate Swaps (Details) link:presentationLink link:calculationLink link:definitionLink 9955529 - Disclosure - Derivatives - Schedule of Interest Rate Swaps (Details) link:presentationLink link:calculationLink link:definitionLink 9955530 - Disclosure - Derivatives - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955531 - Disclosure - Derivatives - Schedule of Components of the Unrealized Gain (Loss) (Details) link:presentationLink link:calculationLink link:definitionLink 9955532 - Disclosure - Derivatives - Schedule of Carrying Value of 2028 and 2029 Notes (Details) link:presentationLink link:calculationLink link:definitionLink 9955533 - Disclosure - Derivatives - Schedule of Effect of Offsetting Derivative Contracts (Details) link:presentationLink link:calculationLink link:definitionLink 9955534 - Disclosure - Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) link:presentationLink link:calculationLink link:definitionLink 9955535 - Disclosure - Fair Value Measurements - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Fair Value Measurements - Schedule of Changes in Investments Measured At Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 9955536 - Disclosure - Fair Value Measurements - Schedule of Changes in Investments Measured At Fair Value (Details) link:presentationLink link:calculationLink link:definitionLink 9955537 - Disclosure - Fair Value Measurements - Schedule of Quantitative Information about Level 3 Fair Value Measurements (Details) link:presentationLink link:calculationLink link:definitionLink 9955538 - Disclosure - Fair Value Measurements - Schedule of Carrying Values and Fair Values of Debt (Details) link:presentationLink link:calculationLink link:definitionLink 9955539 - Disclosure - Borrowings - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955540 - Disclosure - Borrowings - 2024 Debt Securitization - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955541 - Disclosure - Borrowings - Schedule of Debt Securitization (Details) link:presentationLink link:calculationLink link:definitionLink 9955542 - Disclosure - Borrowings - Schedule of Interest Rate and Interest Differential Analysis (Details) link:presentationLink link:calculationLink link:definitionLink 9955543 - Disclosure - Borrowings - 2018 Debt Securitization - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955544 - Disclosure - Borrowings - GCIC 2018 Debt Securitization - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955545 - Disclosure - Borrowings - GBDC 3 2021 Debt Securitization - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955546 - Disclosure - Borrowings - GBDC 3 2022 Debt Securitization - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955547 - Disclosure - Borrowings - GBDC 3 2022-2 Debt Securitization - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955548 - Disclosure - Borrowings - GBDC 3 DB Credit Facility (Details) link:presentationLink link:calculationLink link:definitionLink 9955549 - Disclosure - Borrowings - JPM Credit Facility - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955550 - Disclosure - Borrowings - 2026 Notes - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955551 - Disclosure - Borrowings - 2027 Notes - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955552 - Disclosure - Borrowings - 2028 Notes - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 9955553 - Disclosure - Borrowings - 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Disclosure - Common Stock Transactions - Schedule of Common Stock Issued Under ATM Plan (Details) link:presentationLink link:calculationLink link:definitionLink 9955562 - Disclosure - Common Stock Transactions - Schedule of Repurchases Under the Program (Details) link:presentationLink link:calculationLink link:definitionLink 9955563 - Disclosure - Dividends and Distributions (Details) link:presentationLink link:calculationLink link:definitionLink 9955564 - Disclosure - Subsequent Events (Details) link:presentationLink link:calculationLink link:definitionLink