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Other assets (Tables) | 12 Months Ended
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Dec. 31, 2024
Other assets |
Schedule of Other Assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2023 |  | 2024
​ | ​ | (In millions)
Other assets: |  | ​ |  |  | ​ |
Note receivables - OPA | ​ | $ | 69.1 | ​ | $ | 91.6
Operating lease right-of-use assets | ​ |  | 22.7 | ​ |  | 20.6
IBNR receivables | ​ |  | 13.4 | ​ |  | 15.0
Land held for development | ​ | ​ | 19.4 | ​ | ​ | 7.4
Restricted cash and cash equivalents | ​ | ​ | 32.4 | ​ | ​ | 5.5
Other | ​ |  | 16.7 | ​ |  | 21.4
Total | ​ | $ | 173.7 | ​ | $ | 161.5
Schedule of Maturities of Operating Lease Liabilities | ​
​ | ​ | ​ | ​
Years ending December 31, |  | Amount
​ | ​ | (In millions)
2025 | ​ | $ | 4.4
2026 | ​ |  | 4.0
2027 | ​ |  | 2.8
2028 | ​ |  | 2.3
2029 | ​ |  | 2.0
2030 and thereafter | ​ |  | 14.6
Total remaining lease payments | ​ |  | 30.1
Less imputed interest | ​ |  | 9.5
Total lease obligations | ​ |  | 20.6
Less current obligations | ​ |  | 3.5
Long term lease obligations | ​ | $ | 17.1

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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-6 + Details
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- Definition Tabular disclosure of noncurrent assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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