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Other noncurrent liabilities
6 Months Ended
Jun. 30, 2025
Other noncurrent liabilities  
Other noncurrent liabilities

Note 9 – Other noncurrent liabilities:

​

​

​

​

​

​

​

​

​

    

December 31, 

    

June 30, 

​

​

2024

​

2025

​

​

(In millions)

Accrued development costs

​

$

26.8

​

$

24.7

Operating lease liabilities

​

​

17.1

​

​

17.1

Insurance claims and expenses

​

 

16.6

​

 

16.6

Asset retirement obligations

​

​

14.3

​

​

16.2

Deferred income

​

​

11.8

​

​

8.0

Other postretirement benefits

​

 

6.7

​

 

7.0

Employee benefits

​

 

4.5

​

 

5.0

Earn-out liability

​

​

4.3

​

​

4.6

Other

​

 

.6

​

 

.5

Total

​

$

102.7

​

$

99.7

​

See Notes 17 and 18 for additional details related to the acquisition earn-out liability.