LEASES: (Tables)

3 Months Ended

Mar. 31, 2020

LEASES:

Schedule of the operating lease expense recognized

The operating lease expense recognized in the three months ended March 31, 2020 and 2019 was classified as follows (in millions):

Classification	2020		2019
Cost of sales (exclusive of depreciation, amortization and depletion)	$	28.9	$	28.8
Selling, general and administrative		0.1		0.1
Exploration		(*)		(*)
Total lease expense	$	29.0	$	28.9

(*) amount is lower than $0.1 million

Schedule of Maturities of lease liabilities

	Lease liabilities
Year	(in millions)
2020	$	87.0
2021		116.0
2022		112.9
2023		111.6
2024		103.6
After 2024		826.3
Total lease payments	$	1,357.4
Less: interest on lease liabilities		(327.9)
Present value of lease payments	$	1,029.5