v3.25.2

Borrowings (Tables) | 9 Months Ended
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Jun. 30, 2025
Debt Disclosure [Abstract] |
Schedule of Components of Debt | The below table presents the components of the carrying value of the 2025 Notes, the 2027 Notes, the 2029 Notes and the 2030 Notes as of June 30, 2025 and September 30, 2024:
|  | As of June 30, 2025 |  | As of September 30, 2024
($ in millions) |  | 2027 Notes |  | 2029 Notes |  | 2030 Notes |  | 2025 Notes |  | 2027 Notes |  | 2029 Notes
Principal |  | $ | 350.0 |  |  | $ | 300.0 |  |  | $ | 300.0 |  |  | $ | 300.0 |  |  | $ | 350.0 |  |  | $ | 300.0 |
Unamortized financing costs |  | (1.2) |  |  | (2.4) |  |  | (3.5) |  |  | (0.3) |  |  | (1.8) |  |  | (2.9) |
Unaccreted discount |  | (0.3) |  |  | (2.3) |  |  | — |  |  | (0.2) |  |  | (0.4) |  |  | (2.7) |
Interest rate swap fair value adjustment |  | (14.9) |  |  | 4.3 |  |  | 7.9 |  |  | — |  |  | (20.2) |  |  | 7.2 |
Net carrying value |  | $ | 333.6 |  |  | $ | 299.6 |  |  | $ | 304.4 |  |  | $ | 299.5 |  |  | $ | 327.6 |  |  | $ | 301.6 |
Fair Value |  | $ | 335.7 |  |  | $ | 309.2 |  |  | $ | 301.0 |  |  | $ | 298.1 |  |  | $ | 327.7 |  |  | $ | 312.3 |
The below table presents the components of interest and other debt expenses related to the 2025 Notes, the 2027 Notes, the 2029 Notes and the 2030 Notes for the three and nine months ended June 30, 2025:
| 2025 Notes |  | 2027 Notes |  | 2029 Notes |  | 2030 Notes
($ in millions) | Three months ended June 30, 2025 |  | Nine months ended June 30, 2025 |  | Three months ended June 30, 2025 |  | Nine months ended June 30, 2025 |  | Three months ended June 30, 2025 |  | Nine months ended June 30, 2025 |  | Three months ended June 30, 2025 |  | Nine months ended June 30, 2025
Coupon interest | $ | — |  |  | $ | 4.2 |  |  | $ | 2.4 |  |  | $ | 7.1 |  |  | $ | 5.3 |  |  | $ | 16.0 |  |  | $ | 4.8 |  |  | $ | 6.6 |
Amortization of financing costs and discount | — |  |  | 0.5 |  |  | 0.2 |  |  | 0.7 |  |  | 0.3 |  |  | 0.9 |  |  | 0.2 |  |  | 0.3 |
Effect of interest rate swap | — |  |  | — |  |  | 3.2 |  |  | 10.1 |  |  | 0.3 |  |  | 1.4 |  |  | 0.2 |  |  | 0.2 |
Total interest expense | $ | — |  |  | $ | 4.7 |  |  | $ | 5.8 |  |  | $ | 17.9 |  |  | $ | 5.9 |  |  | $ | 18.3 |  |  | $ | 5.2 |  |  | $ | 7.1 |
Coupon interest rate (net of effect of interest rate swaps) | 3.500 | % |  | 3.500 | % |  | 6.280 | % |  | 6.458 | % |  | 7.450 | % |  | 7.650 | % |  | 6.515 | % |  | 6.514 | %
The below table presents the components of interest and other debt expenses related to the 2025 Notes, the 2027 Notes and the 2029 Notes for the three and nine months ended June 30, 2024:
| 2025 Notes |  | 2027 Notes |  | 2029 Notes
($ in millions) | Three months ended June 30, 2024 |  | Nine months ended June 30, 2024 |  | Three months ended June 30, 2024 |  | Nine months ended June 30, 2024 |  | Three months ended June 30, 2024 |  | Nine months ended June 30, 2024
Coupon interest | $ | 2.6 |  |  | $ | 7.9 |  |  | $ | 2.4 |  |  | $ | 7.1 |  |  | $ | 5.3 |  |  | $ | 16.0 |
Amortization of financing costs and discount | 0.3 |  |  | 0.9 |  |  | 0.2 |  |  | 0.7 |  |  | 0.3 |  |  | 1.0 |
Effect of interest rate swap | — |  |  | — |  |  | 4.0 |  |  | 12.3 |  |  | 1.1 |  |  | 3.4 |
Total interest expense | $ | 2.9 |  |  | $ | 8.8 |  |  | $ | 6.6 |  |  | $ | 20.1 |  |  | $ | 6.7 |  |  | $ | 20.4 |
Coupon interest rate (net of effect of interest rate swaps) | 3.500 | % |  | 3.500 | % |  | 7.213 | % |  | 7.262 | % |  | 8.440 | % |  | 8.469 | %

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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