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LEASES: (Tables) | 12 Months Ended
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Dec. 31, 2023
LEASES: |
Schedule of the operating lease expense recognized | The operating lease expense recognized in the years ended December 31, 2023, 2022 and 2021 was classified as follows (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Classification |  | 2023 |  | 2022 | ​ | 2021
Cost of sales (exclusive of depreciation, amortization and depletion) |  | $ | 115.4 | ​ | $ | 115.5 | ​ | $ | 108.1
Selling, general and administrative | ​ |  | 0.1 | ​ |  | 0.1 | ​ |  | 0.1
Exploration | ​ |  | 0.1 | ​ |  | 0.1 | ​ |  | 0.2
Total lease expense |  | $ | 115.6 | ​ | $ | 115.7 | ​ | $ | 108.4
Schedule of Maturities of lease liabilities | ​
​ | ​ | ​ | ​
​ | ​ | Lease liabilities
Year |  | (in millions)
2024 |  | $ | 112.7
2025 | ​ |  | 105.6
2026 | ​ |  | 105.4
2027 | ​ |  | 105.1
2028 | ​ |  | 104.7
After 2028 | ​ |  | 416.4
Total lease payments |  | $ | 949.9
Less: interest on lease liabilities | ​ |  | (174.5)
Present value of lease payments |  | $ | 775.4
​

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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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