v3.25.3
DEBT (Tables)
9 Months Ended
Sep. 30, 2025
Debt Disclosure [Abstract]  
Schedule of Debt
Debt is detailed as follows:
in millionsEffective
Interest Rates
September 30
2025
December 31
2024
September 30
2024
Bank line of credit expires 2029
$0.0 $0.0 $0.0 
Commercial paper expires 2029
0.0 0.0 0.0 
Total short-term debt$0.0 $0.0 $0.0 
Bank line of credit expires 2029 1
$0.0 $0.0 $0.0 
Commercial paper expires 2029 1
0.0 550.0 550.0 
4.50% notes due 2025
0.0 400.0 400.0 
3.90% notes due 2027
4.00%400.0 400.0 400.0 
4.95% notes due 2029
5.17%500.0 500.0 0.0 
3.50% notes due 2030
3.94%750.0 750.0 750.0 
5.35% notes due 2034
5.48%750.0 750.0 0.0 
7.15% notes due 2037
8.05%129.2 129.2 129.2 
4.50% notes due 2047
4.59%700.0 700.0 700.0 
4.70% notes due 2048
5.42%460.9 460.9 460.9 
5.70% notes due 2054
5.82%750.0 750.0 0.0 
Other notes0.4 1.0 1.0 
Total long-term debt - face value$4,440.5 $5,391.1 $3,391.1 
Unamortized discounts and debt issuance costs(79.7)(83.7)(61.4)
Total long-term debt - book value$4,360.8 $5,307.4 $3,329.7 
Current maturities(0.4)(400.5)(0.5)
Total long-term debt - reported value$4,360.4 $4,906.9 $3,329.2 
Estimated fair value of long-term debt$4,354.8 $4,762.6 $3,286.9 
1Borrowings on the bank line of credit and commercial paper are classified as long-term if we have the intent and ability to extend payment beyond twelve months.
Schedule of Standby Letters of Credit Our standby letters of credit as of September 30, 2025 are summarized by purpose in the table below:
in millions 
Risk management insurance$9.8 
Reclamation/restoration requirements18.7 
Total standby letters of credit$28.5