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v3.23.1

Other Assets (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2023
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract] |
Other Assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | March 31,
​ | ​ | 2022 | ​ | 2023
​ | ​ | (In millions)
Other noncurrent assets: |  | ​ |  |  | ​ |
Restricted cash and cash equivalents | ​ | $ | 37.2 | ​ | $ | 30.9
Note receivables - OPA | ​ | ​ | 49.3 | ​ | ​ | 46.5
Land held for development | ​ | ​ | 29.7 | ​ | ​ | 29.6
Operating lease right-of-use assets | ​ |  | 21.5 | ​ |  | 21.3
IBNR receivables | ​ |  | 16.8 | ​ |  | 15.4
Pension asset | ​ |  | 9.3 | ​ |  | 9.8
Other | ​ |  | 24.3 | ​ |  | 24.8
Total | ​ | $ | 188.1 | ​ | $ | 178.3
​

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- Definition Tabular disclosure of noncurrent assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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