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Other noncurrent liabilities (Tables)

9 Months Ended

Sep. 30, 2025

Other noncurrent liabilities

Other noncurrent liabilities

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​	​	​	​	​	​	​
​		December 31,			September 30,
​	​	2024		​	2025
​	​	(In millions)
Accrued development costs	​	$	26.8	​	$	24.3
Asset retirement obligations	​	​	14.3	​	​	16.7
Insurance claims and expenses	​		16.6	​		16.6
Operating lease liabilities	​	​	17.1	​	​	16.5
Deferred income	​	​	11.8	​	​	8.2
Other postretirement benefits	​		6.7	​		6.8
Employee benefits	​		4.5	​		4.8
Earn-out liability	​	​	4.3	​	​	—
Other	​		.6	​		.6
Total	​	$	102.7	​	$	94.5

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Tabular disclosure of other noncurrent liabilities.

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