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LEASES: (Tables)

3 Months Ended

Mar. 31, 2022

LEASES:

Schedule of the operating lease expense recognized

The operating lease expense recognized in the first three months of 2022 and 2021 was classified as follows (in millions):

​

​	​	​	​	​	​	​
Classification		2022			2021
Cost of sales (exclusive of depreciation, amortization and depletion)		$	28.8	​	$	28.6
Selling, general and administrative	​		(*)	​		(*)
Exploration	​		(*)	​		(*)
Total lease expense		$	28.8	​	$	28.6

Schedule of Maturities of lease liabilities

​

​	​	​	​
​	​	Lease liabilities
Year		(in millions)
2022		$	86.1
2023	​		113.9
2024	​		106.3
2025	​		105.3
2026	​		105.1
After 2026	​		624.2
Total lease payments		$	1,140.9
Less: interest on lease liabilities	​		(240.1)
Present value of lease payments		$	900.8

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980

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Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980

+ Details

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Balance Type:	na
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