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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 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 | )
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 | )
Schedule of Marketable Securities and Fair Value Measurements |
|  | Fair Value Measurements |
|  | Total |  |  | Quoted Prices in Active Markets (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
|  | (In millions) |
December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets |  | $ | 4.4 |  |  | $ | — |  |  | $ | 4.4 |  |  | $ | — |
Noncurrent assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Amalgamated Sugar Company LLC |  | $ | 250.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 250.0 |
Fixed income securities |  |  | 2.9 |  |  |  | — |  |  |  | 2.9 |  |  |  | — |
Mutual funds and common stocks |  |  | .6 |  |  |  | .6 |  |  |  | — |  |  |  | — |
Total |  | $ | 253.5 |  |  | $ | .6 |  |  | $ | 2.9 |  |  | $ | 250.0 |
December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets |  | $ | 3.0 |  |  | $ | — |  |  | $ | 3.0 |  |  | $ | — |
Noncurrent assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Amalgamated Sugar Company LLC |  | $ | 250.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 250.0 |
Fixed income securities |  |  | 4.4 |  |  |  | — |  |  |  | 4.4 |  |  |  | — |
Common stocks and exchange traded funds |  |  | 1.3 |  |  |  | 1.3 |  |  |  | — |  |  |  | — |
Total |  | $ | 255.7 |  |  | $ | 1.3 |  |  | $ | 4.4 |  |  | $ | 250.0 |

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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