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Other Noncurrent Liabilities | 6 Months Ended
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Jun. 30, 2022
Other Liabilities Disclosure [Abstract] |
Other Noncurrent Liabilities | ​ Note 8 – Other noncurrent liabilities: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | June 30,
​ | ​ | 2021 | ​ | 2022
​ | ​ | (In millions)
Deferred income | ​ | $ | 81.6 | ​ | $ | 56.7
Accrued development costs | ​ |  | 55.4 | ​ |  | 53.5
Accrued litigation settlement | ​ |  | 38.5 | ​ |  | 38.9
Insurance claims and expenses | ​ |  | 36.4 | ​ |  | 32.2
Operating lease liabilities | ​ | ​ | 15.8 | ​ | ​ | 15.5
Other postretirement benefits | ​ |  | 10.2 | ​ |  | 9.9
Employee benefits | ​ |  | 6.1 | ​ |  | 5.4
Reserve for uncertain tax positions | ​ |  | 3.5 | ​ |  | 4.9
Other | ​ |  | 10.0 | ​ |  | 6.5
Total | ​ | $ | 257.5 | ​ | $ | 223.5
​ The accrued litigation settlement is discussed in Note 15.

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- Definition The entire disclosure for other liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20,24) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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