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Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2018
Investments Debt And Equity Securities [Abstract] |
Schedule of Marketable Securities |
| Market value |  |  | Cost basis |  |  | Unrealized losses, net |
| (In millions) |
December 31, 2017: |  |  |  |  |  |  |  |  |  |  |
Current assets | $ | 3.0 |  |  |  | 3.0 |  |  |  | — |
Noncurrent assets: |  |  |  |  |  |  |  |  |  |  |
The Amalgamated Sugar Company LLC | $ | 250.0 |  |  |  | 250.0 |  |  |  | — |
Other |  | 5.7 |  |  |  | 5.9 |  |  |  | (.2 | )
Total | $ | 255.7 |  |  |  | 255.9 |  |  |  | (.2 | )
June 30, 2018: |  |  |  |  |  |  |  |  |  |  |
Current assets | $ | 1.6 |  |  |  | 1.6 |  |  |  | — |
Noncurrent assets: |  |  |  |  |  |  |  |  |  |  |
The Amalgamated Sugar Company LLC | $ | 250.0 |  |  | $ | 250.0 |  |  | $ | — |
Other |  | 6.8 |  |  |  | 7.1 |  |  |  | (.3 | )
Total | $ | 256.8 |  |  | $ | 257.1 |  |  | $ | (.3 | )

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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