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Other income, net (Tables) | 12 Months Ended
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Dec. 31, 2021
Other Income And Expenses [Abstract] |
Schedule of Components of Other Income | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Years ended December 31,
​ |  | 2019 |  | 2020 |  | 2021
​ | ​ | (In millions)
Securities earnings: |  | ​ |  |  | ​ |  |  | ​ |
Dividends and interest |  | $ | 10.9 |  | $ | 4.8 |  | $ | 4.0
Securities transactions, net | ​ | ​ | .3 | ​ | ​ | (.1) | ​ | ​ | —
Total | ​ | ​ | 11.2 | ​ | ​ | 4.7 | ​ |  | 4.0
Gain on land sales | ​ | ​ | 4.4 | ​ | ​ | 4.5 | ​ | ​ | 16.0
Infrastructure reimbursements | ​ |  | 9.2 | ​ |  | 19.7 | ​ |  | 15.3
Insurance recoveries | ​ |  | 7.7 | ​ |  | 1.6 | ​ |  | .1
Currency transactions, net | ​ | ​ | 2.0 | ​ | ​ | (4.0) | ​ | ​ | 1.6
Disposal of property and equipment, net | ​ |  | (.3) | ​ |  | (.2) | ​ |  | (.6)
Gain on sale of business | ​ |  | 3.0 | ​ |  | — | ​ |  | —
Other, net | ​ | ​ | 3.7 | ​ | ​ | 2.1 | ​ | ​ | 2.6
Total | ​ | $ | 40.9 | ​ | $ | 28.4 | ​ | $ | 39.0

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