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Leases (Tables) | 12 Months Ended
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Dec. 31, 2024
Leases [Abstract] |
Components of Lease Expense | The components of lease expense for the periods presented below were as follows:
| Year Ended December 31,
| 2024 |  | 2023 |  | 2022
| (Dollars in millions)
Operating lease cost: |  |  |  |  |
Operating leases | $ | 36.9 |  |  | $ | 22.1 |  |  | $ | 18.9 |
Short-term leases | 32.7 |  |  | 44.3 |  |  | 30.6 |
Variable leases | 4.7 |  |  | 8.7 |  |  | 7.6 |
Sublease income | (0.6) |  |  | (1.4) |  |  | (1.3) |
Total operating lease cost | $ | 73.7 |  |  | $ | 73.7 |  |  | $ | 55.8 |
Finance lease cost: |  |  |  |  |
Amortization of right-of-use assets | $ | 8.8 |  |  | $ | 7.2 |  |  | $ | 6.3 |
Interest on lease liabilities | 1.8 |  |  | 1.7 |  |  | 2.1 |
Total finance lease cost | $ | 10.6 |  |  | $ | 8.9 |  |  | $ | 8.4 |
Schedule of Supplemental Balance Sheet Information Related to Leases | Supplemental balance sheet information related to leases at December 31, 2024 and 2023 was as follows:
| December 31,
| 2024 |  | 2023
| (Dollars in millions)
Operating leases: |  |  |
Operating lease right-of-use assets | $ | 119.3 |  |  | $ | 61.9 |
Accounts payable and accrued expenses | $ | 32.4 |  |  | $ | 17.3 |
Operating lease liabilities, less current portion | 86.7 |  |  | 47.7 |
Total operating lease liabilities | $ | 119.1 |  |  | $ | 65.0 |
Finance leases: |  |  |
Property, plant, equipment and mine development | $ | 46.8 |  |  | $ | 34.3 |
Accumulated depreciation | (22.8) |  |  | (15.4) |
Property, plant, equipment and mine development, net | $ | 24.0 |  |  | $ | 18.9 |
Current portion of long-term debt | $ | 15.8 |  |  | $ | 13.5 |
Long-term debt, less current portion | 9.3 |  |  | 8.8 |
Total finance lease liabilities | $ | 25.1 |  |  | $ | 22.3 |
Weighted average remaining lease term (years) |  |  |
Operating leases | 4.0 |  | 4.6
Finance leases | 5.2 |  | 2.3
Weighted average discount rate |  |  |
Operating leases | 7.1 | % |  | 6.8 | %
Finance leases | 6.2 | % |  | 6.8 | %
Schedule of Supplemental Cash Flow Information Related to Leases | Supplemental cash flow information related to leases for the periods presented below was as follows:
| Year Ended December 31,
| 2024 |  | 2023 |  | 2022
| (Dollars in millions)
Cash paid for amounts included in the measurement of lease liabilities: |  |  |  |  |
Operating cash flows for operating leases | $ | 34.1 |  |  | $ | 18.8 |  |  | $ | 20.5 |
Operating cash flows for finance leases | 1.8 |  |  | 1.7 |  |  | 2.1 |
Financing cash flows for finance leases | 10.4 |  |  | 9.0 |  |  | 9.3 |
Right-of-use assets obtained in exchange for lease obligations: |  |  |  |  |
Operating leases | 84.9 |  |  | 55.6 |  |  | 13.5 |
Finance leases | 14.4 |  |  | 6.7 |  |  | 6.4 |
Lessee, Operating Lease, Liability, Maturity | The Company's leases have remaining lease terms ranging from 1 year to 10 years, and may include options to extend the terms, as applicable. The contractual maturities of lease liabilities were as follows:
Period Ending December 31, |  | Operating Leases |  | Finance Leases
|  | (Dollars in millions)
2025 |  | $ | 38.2 |  |  | $ | 16.6 |
2026 |  | 34.4 |  |  | 8.0 |
2027 |  | 29.0 |  |  | 2.4 |
2028 |  | 22.5 |  |  | 0.7 |
2029 |  | 5.8 |  |  | 0.1 |
2030 and thereafter |  | 3.1 |  |  | — |
Total lease payments |  | 133.0 |  |  | 27.8 |
Less imputed interest |  | (13.9) |  |  | (2.7) |
Total lease liabilities |  | $ | 119.1 |  |  | $ | 25.1 |
Finance Lease, Liability, Maturity | The Company's leases have remaining lease terms ranging from 1 year to 10 years, and may include options to extend the terms, as applicable. The contractual maturities of lease liabilities were as follows:
Period Ending December 31, |  | Operating Leases |  | Finance Leases
|  | (Dollars in millions)
2025 |  | $ | 38.2 |  |  | $ | 16.6 |
2026 |  | 34.4 |  |  | 8.0 |
2027 |  | 29.0 |  |  | 2.4 |
2028 |  | 22.5 |  |  | 0.7 |
2029 |  | 5.8 |  |  | 0.1 |
2030 and thereafter |  | 3.1 |  |  | — |
Total lease payments |  | 133.0 |  |  | 27.8 |
Less imputed interest |  | (13.9) |  |  | (2.7) |
Total lease liabilities |  | $ | 119.1 |  |  | $ | 25.1 |

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- Definition Tabular disclosure of undiscounted cash flows of finance lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to finance lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-6 + Details
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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-6 + Details
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