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Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2017
Investments Debt And Equity Securities [Abstract] |
Schedule of Marketable Securities |
| Market value |  |  | Cost basis |  |  | Unrealized losses, net |
| (In millions) |
December 31, 2016: |  |  |  |  |  |  |  |  |  |  |
Current assets | $ | 4.4 |  |  | $ | 4.4 |  |  | $ | — |
Noncurrent assets: |  |  |  |  |  |  |  |  |  |  |
The Amalgamated Sugar Company LLC | $ | 250.0 |  |  | $ | 250.0 |  |  | $ | — |
Other |  | 3.5 |  |  |  | 3.7 |  |  |  | (.2 | )
Total | $ | 253.5 |  |  | $ | 253.7 |  |  | $ | (.2 | )
June 30, 2017: |  |  |  |  |  |  |  |  |  |  |
Current assets | $ | .8 |  |  | $ | .8 |  |  | $ | — |
Noncurrent assets: |  |  |  |  |  |  |  |  |  |  |
The Amalgamated Sugar Company LLC | $ | 250.0 |  |  | $ | 250.0 |  |  | $ | — |
Other |  | 7.2 |  |  |  | 7.4 |  |  |  | (.2 | )
Total | $ | 257.2 |  |  | $ | 257.4 |  |  | $ | (.2 | )

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