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LEASES: (Tables)

9 Months Ended

Sep. 30, 2025

LEASES:

Schedule of the operating lease expense recognized

The operating lease expense recognized in the nine-month periods ended September 30, 2025 and 2024 was classified as follows (in millions):

​

​	​	​	​	​	​	​
Classification		2025			2024
Cost of sales (exclusive of depreciation, amortization and depletion)		$	83.5	​	$	77.4
Selling, general and administrative	​		0.1	​		0.1
Exploration	​		0.1	​		0.1
Total lease expense		$	83.7	​	$	77.5

Schedule of Maturities of lease liabilities

​

​	​	​	​
​	​	Lease liabilities
Year		(in millions)
2025		$	29.1
2026	​		116.2
2027	​		115.7
2028	​		115.2
2029	​		113.2
After 2029	​		317.3
Total lease payments		$	806.7
Less: interest on lease liabilities	​		(123.3)
Present value of lease payments		$	683.4

​

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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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Balance Type:	na
Period Type:	duration