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Borrowings (Tables)
3 Months Ended
Dec. 31, 2025
Debt Disclosure [Abstract]  
Schedule of Components of Interest Expenses and Credit Facilities and Unsecured Notes
Below is a summary of the Company's credit facilities as of December 31, 2025 and September 30, 2025:

 December 31, 2025
($ in millions)Aggregate Principal CommittedOutstanding PrincipalUnfunded CommitmentUnamortized Debt Financing CostsAvailability PeriodMaturity Date
ING Credit Agreement$1,235.0 $450.0 $785.0 $8.0 4/11/20294/11/2030
JPM SPV Facility700.0 566.0 134.0 4.7 7/3/20297/3/2030
DBNY SPV Facility400.0 355.0 45.0 3.2 7/25/20287/25/2029
MS SPV Facility400.0 233.4 166.6 3.0 7/3/20287/3/2029
Total$2,735.0 $1,604.4 $1,130.6 $18.9 

 September 30, 2025
($ in millions)Aggregate Principal CommittedOutstanding PrincipalUnfunded CommitmentUnamortized Debt Financing CostsAvailability PeriodMaturity Date
ING Credit Agreement$1,235.0 $370.0 $865.0 $8.5 4/11/20294/11/2030
JPM SPV Facility700.0 566.0 134.0 4.9 7/3/20297/3/2030
DBNY SPV Facility400.0 280.0 120.0 3.4 7/25/20287/25/2029
MS SPV Facility400.0 133.4 266.6 3.2 7/3/20287/3/2029
Total$2,735.0 $1,349.4 $1,385.6 $20.0 

Below is a summary of the Company's unsecured notes as of December 31, 2025 and September 30, 2025:

 December 31, 2025
($ in millions)Outstanding Principal Unamortized Financing CostsUnaccreted DiscountSwap Fair Value AdjustmentCarrying ValueFair ValueMaturity Date
2028 Notes$350.0 $(2.6)$(1.0)$8.5 $354.9 $377.4 11/14/2028
2029 Notes400.0 (3.6)(1.7)6.0 400.7 411.9 7/23/2029
2030 Notes400.0 (4.4)(0.1)3.7 399.2 402.4 7/15/2030
Total$1,150.0 $(10.6)$(2.8)$18.2 $1,154.8 $1,191.7 

 September 30, 2025
($ in millions)Outstanding Principal Unamortized Financing CostsUnaccreted DiscountSwap Fair Value AdjustmentCarrying ValueFair ValueMaturity Date
2028 Notes$350.0 $(2.8)$(1.1)$9.0 $355.1 $380.1 11/14/2028
2029 Notes400.0 (3.8)(1.8)6.5 400.9 415.1 7/23/2029
2030 Notes400.0 (4.7)(0.1)4.0 399.2 408.9 7/15/2030
Total$1,150.0 $(11.3)$(3.0)$19.5 $1,155.2 $1,204.1 
The table below presents the components of interest expense for the following periods:
($ in millions, except percentage)Three Months Ended December 31, 2025Three Months Ended December 31, 2024
Stated interest expense$42.2 $36.7 
Credit facility fees1.6 2.0 
Amortization of debt financing costs2.2 2.1 
Effect of interest rate swaps0.5 1.6 
Total interest expense$46.5 $42.4 
Weighted average interest rate (1)
6.255 %7.633 %
Weighted average outstanding balance$2,669.3 $1,965.2 
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(1) The weighted average interest rate includes the effect of the interest rate swaps and excludes the impact of credit facility fees and amortization of debt financing costs.