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Other Assets (Tables) | 6 Months Ended
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Jun. 30, 2022
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract] |
Other Assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | June 30,
​ | ​ | 2021 | ​ | 2022
​ | ​ | (In millions)
Other noncurrent assets: |  | ​ |  |  | ​ |
Restricted cash and cash equivalents | ​ | $ | 41.9 | ​ | $ | 36.8
Note receivables - OPA | ​ |  | 38.7 | ​ |  | 36.6
IBNR receivables | ​ |  | 34.4 | ​ |  | 30.7
Land held for development | ​ | ​ | 36.0 | ​ | ​ | 27.2
Operating lease right-of-use assets | ​ |  | 19.9 | ​ |  | 19.3
Pension asset | ​ |  | 9.0 | ​ |  | 8.4
Marketable securities | ​ |  | 3.3 | ​ |  | 3.5
Other | ​ |  | 16.8 | ​ |  | 19.1
Total | ​ | $ | 200.0 | ​ | $ | 181.6

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- Definition Tabular disclosure of noncurrent assets. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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