​

  ​ ​ ​

December 31, 

​

June 30, 

​

  ​ ​ ​

2025

  ​ ​ ​

2026

​

​

(In millions)

Asset retirement obligations

​

$

14.7

​

$

15.0

Accrued postretirement benefits

​

​

5.7

​

​

5.5

Uncertain tax positions

​

​

-

​

​

5.4

Employee benefits

​

4.6

​

4.3

Other

​

2.7

​

2.6

Total

​

$

27.7

​

$

32.8