XML 26 R16.htm IDEA: XBRL DOCUMENT
v3.24.3

Other noncurrent liabilities | 9 Months Ended
--- | ---
Sep. 30, 2024
Other noncurrent liabilities |
Other noncurrent liabilities | Note 9 – Other noncurrent liabilities: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | September 30,
​ | ​ | 2023 | ​ | 2024
​ | ​ | (In millions)
Accrued development costs | ​ | $ | 42.3 | ​ | $ | 35.7
Operating lease liabilities | ​ | ​ | 18.6 | ​ | ​ | 18.1
Insurance claims and expenses | ​ |  | 14.9 | ​ |  | 15.0
Asset retirement obligations | ​ | ​ | 7.2 | ​ | ​ | 14.5
Deferred income | ​ | ​ | 15.5 | ​ | ​ | 12.3
Other postretirement benefits | ​ |  | 7.4 | ​ |  | 7.2
Employee benefits | ​ |  | 4.9 | ​ |  | 4.7
Earn-out liability | ​ | ​ | — | ​ | ​ | 4.2
Accrued litigation settlement | ​ |  | 16.1 | ​ | ​ | —
Other | ​ |  | .6 | ​ |  | .6
Total | ​ | $ | 127.5 | ​ | $ | 112.3
​ The accrued litigation settlement is discussed in Note 16. See Notes 17 and 19 for additional details related to the acquisition earn-out liability.

X
- References No definition available. + Details
Name: | us-gaap_OtherLiabilitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for other liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(20)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(24)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 405 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/405/tableOfContent + Details
Name: | us-gaap_OtherLiabilitiesDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration