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LEASES (Tables)
12 Months Ended
Dec. 31, 2024
Leases [Abstract]  
Schedule of Lease Assets and Liabilities, Weighted-Average Lease Term and Discount Rate
Lease right-of-use (ROU) assets and liabilities reflected on our December 31 balance sheets and the weighted-average lease terms and discount rates are as follows:
dollars in millionsClassification on the Balance Sheet20242023
Assets
Operating lease ROU assets$673.2 $636.1 
Accumulated amortization(146.8)(124.4)
Operating leases, netOperating lease right-of-use assets, net526.4 511.7 
Finance lease ROU assets54.7 62.3 
Accumulated depreciation(24.3)(20.2)
Finance leases, netProperty, plant & equipment, net30.4 42.1 
Total lease assets$556.8 $553.8 
Liabilities
Current
OperatingOther current liabilities$49.3 $47.3 
FinanceOther current liabilities10.7 12.5 
Noncurrent
Operating Noncurrent operating lease liabilities521.4 507.4 
FinanceOther noncurrent liabilities9.7 16.6 
Total lease liabilities$591.1 $583.8 
Lease Term and Discount Rate
Weighted-average remaining lease term (years)
Operating leases18.919.5
Finance leases2.22.5
Weighted-average discount rate
Operating leases4.5 %4.3 %
Finance leases3.2 %2.4 %
Schedule of Components of Lease Expense
The components of lease expense for the years ended December 31, 2024, 2023 and 2022 are as follows:
in millions202420232022
Finance lease cost
Depreciation of right-of-use assets$9.5 $12.8 $16.5 
Interest on lease liabilities0.7 0.9 1.2 
Operating lease cost75.6 77.5 85.6 
Short-term lease cost 1
46.9 50.4 46.4 
Variable lease cost20.6 23.5 14.4 
Sublease income(2.8)(3.4)(2.9)
Total lease expense$150.5 $161.7 $161.2 
1Includes the cost of leases with an initial term of one year or less (including those with terms of one month or less).
Schedule of Maturity Analysis on an Undiscounted Basis
Maturity analysis on an undiscounted basis of our lease liabilities (see Note 12 for mineral lease payments) as of December 31, 2024 is as follows:
in millionsOperating
Leases
Finance
Leases
2025$73.8 $11.2 
202666.7 6.7 
202762.2 2.1 
202855.2 0.8 
202950.8 0.4 
Thereafter608.7 0.0 
Total minimum lease payments$917.4 $21.2 
Lease payments representing interest(346.7)(0.8)
Present value of future minimum lease payments$570.7 $20.4 
Current obligations under leases(49.3)(10.7)
Long-term lease obligations$521.4 $9.7