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Leases (Tables) | 9 Months Ended
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Sep. 30, 2025
Leases [Abstract] |
Schedule of Lease Expense, Payments for Operating Leases, and Information Related to Lease Term and Discount Rates | Our expenses and payments for finance leases were as follows:
| Three Months Ended |  | Nine Months Ended
(Dollars in millions) | September 30, 2025 |  | September 30, 2024 |  | September 30, 2025 |  | September 30, 2024
Amortization expense of finance lease right-of-use assets | $ | 0.5 |  |  | $ | 0.2 |  |  | $ | 1.3 |  |  | $ | 0.4 |
Interest expense on finance lease obligations | $ | (0.1) |  |  | $ | — |  |  | $ | (0.3) |  |  | $ | — |
Payments on finance lease obligations | $ | 0.4 |  |  | $ | 0.1 |  |  | $ | 1.2 |  |  | $ | 0.3 |
Our expenses and payments for operating leases were as follows:
| Three Months Ended |  | Nine Months Ended
(Dollars in millions) | September 30, 2025 |  | September 30, 2024 |  | September 30, 2025 |  | September 30, 2024
Operating leases expense | $ | 1.6 |  |  | $ | 1.3 |  |  | $ | 4.5 |  |  | $ | 3.9 |
Short-term leases expense | $ | 0.2 |  |  | $ | 0.2 |  |  | $ | 0.6 |  |  | $ | 0.5 |
Payments on operating lease obligations | $ | 1.2 |  |  | $ | 1.1 |  |  | $ | 4.0 |  |  | $ | 3.5 |
The following table includes information regarding the lease term and discount rates utilized in the calculation of the present value of net future minimum lease payments:
| September 30, 2025 |  | December 31, 2024
Weighted Average Remaining Lease Term |  |  |
Finance leases | 6.9 years |  | 3.4 years
Operating leases | 6.8 years |  | 7.3 years
Weighted Average Discount Rate |  |  |
Finance leases | 4.69% |  | 4.33%
Operating leases | 5.62% |  | 5.63%
Schedule of Assets and Liabilities Balance Related To Finance and Operating Leases | The assets and liabilities balances related to finance and operating leases reflected in the condensed consolidated statements of financial position were as follows:
(Dollars in millions) | Financial Statement Line Item | September 30, 2025 |  | December 31, 2024
Finance lease right-of-use assets | Property, plant and equipment, net | $ | 9.0 |  |  | $ | 1.1 |
Operating lease right-of-use assets | Operating lease right-of-use assets | $ | 22.0 |  |  | $ | 24.1 |
Finance lease obligations, current portion | Other accrued liabilities | $ | 1.4 |  |  | $ | 0.4 |
Finance lease obligations, non-current portion | Other long-term liabilities | $ | 7.7 |  |  | $ | 0.8 |
Total finance lease obligations |  | $ | 9.1 |  |  | $ | 1.2 |
Operating lease obligations, current portion | Operating lease obligations, current portion | $ | 4.1 |  |  | $ | 4.0 |
Operating lease obligations, non-current portion | Operating lease obligations, non-current portion | $ | 18.9 |  |  | $ | 20.6 |
Total operating lease obligations |  | $ | 23.0 |  |  | $ | 24.6 |
Schedule of Finance Lease Liability Maturity | The following table includes future minimum lease payments under finance and operating leases together with the present value of the net future minimum lease payments as of September 30, 2025:
| Finance |  | Operating
(Dollars in millions) | Leases Signed |  | Less: Leases Not Yet Commenced |  | Leases in Effect |  | Leases Signed |  | Less: Leases Not Yet Commenced |  | Leases in Effect
2025 | $ | 0.4 |  |  | $ | — |  |  | $ | 0.4 |  |  | $ | 1.6 |  |  | $ | — |  |  | $ | 1.6 |
2026 | 1.8 |  |  | — |  |  | 1.8 |  |  | 5.0 |  |  | — |  |  | 5.0 |
2027 | 1.6 |  |  | — |  |  | 1.6 |  |  | 4.2 |  |  | — |  |  | 4.2 |
2028 | 1.4 |  |  | — |  |  | 1.4 |  |  | 3.3 |  |  | — |  |  | 3.3 |
2029 | 1.4 |  |  | — |  |  | 1.4 |  |  | 3.2 |  |  | — |  |  | 3.2 |
Thereafter | 4.1 |  |  | — |  |  | 4.1 |  |  | 10.9 |  |  | — |  |  | 10.9 |
Total lease payments | 10.7 |  |  | — |  |  | 10.7 |  |  | 28.2 |  |  | — |  |  | 28.2 |
Less: Interest | (1.6) |  |  | — |  |  | (1.6) |  |  | (5.2) |  |  | — |  |  | (5.2) |
Present Value of Net Future Minimum Lease Payments | $ | 9.1 |  |  | $ | — |  |  | $ | 9.1 |  |  | $ | 23.0 |  |  | $ | — |  |  | $ | 23.0 |
Schedule of Operating Lease Liability Maturity | The following table includes future minimum lease payments under finance and operating leases together with the present value of the net future minimum lease payments as of September 30, 2025:
| Finance |  | Operating
(Dollars in millions) | Leases Signed |  | Less: Leases Not Yet Commenced |  | Leases in Effect |  | Leases Signed |  | Less: Leases Not Yet Commenced |  | Leases in Effect
2025 | $ | 0.4 |  |  | $ | — |  |  | $ | 0.4 |  |  | $ | 1.6 |  |  | $ | — |  |  | $ | 1.6 |
2026 | 1.8 |  |  | — |  |  | 1.8 |  |  | 5.0 |  |  | — |  |  | 5.0 |
2027 | 1.6 |  |  | — |  |  | 1.6 |  |  | 4.2 |  |  | — |  |  | 4.2 |
2028 | 1.4 |  |  | — |  |  | 1.4 |  |  | 3.3 |  |  | — |  |  | 3.3 |
2029 | 1.4 |  |  | — |  |  | 1.4 |  |  | 3.2 |  |  | — |  |  | 3.2 |
Thereafter | 4.1 |  |  | — |  |  | 4.1 |  |  | 10.9 |  |  | — |  |  | 10.9 |
Total lease payments | 10.7 |  |  | — |  |  | 10.7 |  |  | 28.2 |  |  | — |  |  | 28.2 |
Less: Interest | (1.6) |  |  | — |  |  | (1.6) |  |  | (5.2) |  |  | — |  |  | (5.2) |
Present Value of Net Future Minimum Lease Payments | $ | 9.1 |  |  | $ | — |  |  | $ | 9.1 |  |  | $ | 23.0 |  |  | $ | — |  |  | $ | 23.0 |
Schedule of Unrecorded Unconditional Purchase Obligations | The following table includes future minimum lease payments under finance and operating leases together with the present value of the net future minimum lease payments as of September 30, 2025:
| Finance |  | Operating
(Dollars in millions) | Leases Signed |  | Less: Leases Not Yet Commenced |  | Leases in Effect |  | Leases Signed |  | Less: Leases Not Yet Commenced |  | Leases in Effect
2025 | $ | 0.4 |  |  | $ | — |  |  | $ | 0.4 |  |  | $ | 1.6 |  |  | $ | — |  |  | $ | 1.6 |
2026 | 1.8 |  |  | — |  |  | 1.8 |  |  | 5.0 |  |  | — |  |  | 5.0 |
2027 | 1.6 |  |  | — |  |  | 1.6 |  |  | 4.2 |  |  | — |  |  | 4.2 |
2028 | 1.4 |  |  | — |  |  | 1.4 |  |  | 3.3 |  |  | — |  |  | 3.3 |
2029 | 1.4 |  |  | — |  |  | 1.4 |  |  | 3.2 |  |  | — |  |  | 3.2 |
Thereafter | 4.1 |  |  | — |  |  | 4.1 |  |  | 10.9 |  |  | — |  |  | 10.9 |
Total lease payments | 10.7 |  |  | — |  |  | 10.7 |  |  | 28.2 |  |  | — |  |  | 28.2 |
Less: Interest | (1.6) |  |  | — |  |  | (1.6) |  |  | (5.2) |  |  | — |  |  | (5.2) |
Present Value of Net Future Minimum Lease Payments | $ | 9.1 |  |  | $ | — |  |  | $ | 9.1 |  |  | $ | 23.0 |  |  | $ | — |  |  | $ | 23.0 |

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