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Supplemental balance sheet information | 12 Months Ended
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Dec. 31, 2024
Balance Sheet Related Disclosures [Abstract] |
Supplemental balance sheet information | 3. SUPPLEMENTAL BALANCE SHEET INFORMATION Inventories Inventories are comprised of the following:
|  | December 31, |
|  | 2024 |  |  | 2023 |
Raw materials and supplies |  | $ | 16.2 |  |  | $ | 28.2 |
Work in process |  |  | 19.7 |  |  |  | 26.0 |
Finished products and parts |  |  | 165.2 |  |  |  | 182.4 |
Total |  | $ | 201.1 |  |  | $ | 236.6 |
Property, Plant, and Equipment, Net Property, plant and equipment, net is comprised of the following:
|  | December 31, |
|  | 2024 |  |  | 2023 |
Machinery and equipment |  | $ | 2,455.8 |  |  | $ | 2,130.8 |
Mining property and mine development |  |  | 420.3 |  |  |  | 425.3 |
Buildings and leasehold improvements |  |  | 131.0 |  |  |  | 113.9 |
Land |  |  | 12.8 |  |  |  | 13.3 |
Office equipment, software and other |  |  | 17.0 |  |  |  | 17.6 |
Construction in progress |  |  | 36.7 |  |  |  | 88.3 |
Total |  |  | 3,073.6 |  |  |  | 2,789.2 |
Less: accumulated depreciation, depletion and amortization |  |  | (1,312.4 | ) |  |  | (1,010.2 | )
Property, plant, and equipment, net |  | $ | 1,761.2 |  |  | $ | 1,779.0 |
The increase in net property, plant, and equipment was partially due to assets of $200.3 million acquired through our 2024 acquisitions (see “Note 4. Business Combinations”). Depreciation and amortization expense related to property, plant, and equipment was $386.8 million, $387.1 million and $261.2 million in 2024, 2023 and 2022, respectively. Depletion expense was $19.1 million, $16.1 million, and $0.5 million in 2024, 2023 and 2022, respectively. Intangible Assets, Net Intangible assets, net is comprised of the following:
|  | Weighted Average Remaining Amortization period (Years) |  | Estimated Useful Life (in years) |  | Gross Book Value |  |  | Less: Accumulated Amortization |  |  | Net Book Value |
As of December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired technology |  | 7.9 |  | 3-10 |  | $ | 124.7 |  |  | $ | (30.3 | ) |  | $ | 94.4 |
Tradename |  | 9.3 |  | 10 |  |  | 2.9 |  |  |  | (0.2 | ) |  |  | 2.7 |
Patents/License |  | 8 |  | 8 |  |  | 5.9 |  |  |  | (0.2 | ) |  |  | 5.7 |
Customer relationships |  | 2.1 |  | 4 |  |  | 92.5 |  |  |  | (46.4 | ) |  |  | 46.1 |
Intangible assets, net |  | 6.4 |  |  |  | $ | 226.0 |  |  | $ | (77.1 | ) |  | $ | 148.9 |
As of December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired technology |  | 8.7 |  | 3-10 |  | $ | 124.7 |  |  | $ | (17.2 | ) |  | $ | 107.5 |
Customer relationships |  | 2.9 |  | 4 |  |  | 89.6 |  |  |  | (23.6 | ) |  |  | 66.0 |
Intangible assets, net |  | 6.5 |  |  |  | $ | 214.3 |  |  | $ | (40.8 | ) |  | $ | 173.5 |
We amortize other identifiable intangible assets with a definite life on a straight-line basis over the estimated useful lives of the assets. Amortization expense related to intangible assets was $36.3 million, $35.2 million, and $5.6 million in 2024, 2023 and 2022, respectively. The estimated future amortization expense related to intangible assets is $36.7 million in 2025, $35.1 million in 2026, $13.9 million in 2027, $13.6 million in 2028, $12.9 million in 2029, and $36.7 million thereafter. Accrued Expenses Accrued expenses are comprised of the following:
|  | December 31, |
|  | 2024 |  |  | 2023 |
Employee compensation and benefits |  | $ | 22.9 |  |  | $ | 22.6 |
Sales, use, and property taxes |  |  | 21.0 |  |  |  | 24.0 |
Insurance |  |  | 13.2 |  |  |  | 10.9 |
Interest |  |  | 6.1 |  |  |  | 5.4 |
Income taxes |  |  | 1.9 |  |  |  | 1.5 |
Other |  |  | 2.1 |  |  |  | 1.2 |
Total accrued expenses |  | $ | 67.2 |  |  | $ | 65.6 |
Other Current Liabilities Other current liabilities are comprised of the following:
|  | December 31, |
|  | 2024 |  |  | 2023 |
Acquired unfavorable contracts |  | $ | 7.6 |  |  | $ | 43.5 |
Accrued supply commitment charges |  |  | 12.6 |  |  |  | — |
Munger make-whole liability |  |  | 8.6 |  |  |  | 7.5 |
Accrued legal contingencies |  |  | 7.1 |  |  |  | 20.7 |
Deferred revenue |  |  | 7.4 |  |  |  | 7.3 |
Tax receivable agreement obligation |  |  | 3.3 |  |  |  | 2.8 |
Other |  |  | 10.0 |  |  |  | 2.3 |
Total other current liabilities |  | $ | 56.6 |  |  | $ | 84.1 |

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/210/tableOfContent + Details
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