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Other Income, Net - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 6 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Amalgamated Sugar Company LLC | Dec. 31, 2012 Amalgamated Sugar Company LLC | Dec. 31, 2011 Amalgamated Sugar Company LLC | Dec. 31, 2012 TIMET | Dec. 31, 2011 TIMET | Dec. 31, 2012 NL | May 31, 2012 NL Certain Real Property Litigation Settlement | Oct. 31, 2011 NL Certain Real Property Litigation Settlement | Apr. 30, 2009 NL Certain Real Property Litigation Settlement | Oct. 31, 2008 NL Certain Real Property Litigation Settlement | Jun. 30, 2012 NL Certain Real Property Litigation Settlement
Disclosure Other Income Net Additional Information Detail [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends and interest income | $ 26.4 | $ 28.4 | $ 29.2 | $ 25.4 | $ 25.4 | $ 25.4 |  |  |  |  |  |  |  |
Investment in common stock |  |  |  |  |  |  |  | 6.5 |  |  |  |  |  |
Percentage of outstanding common stock held |  |  |  |  |  |  |  | 3.70% |  |  |  |  |  |
Sale of common stock |  |  |  |  |  |  | 107.6 |  |  |  |  |  |  |
Sale of common stock, price per share |  |  |  |  |  |  | $ 16.50 |  |  |  |  |  |  |
Pre-tax gain on sale of shares |  |  |  |  |  |  | 21.6 |  |  |  |  |  |  |
Disposal of property and equipment, net | (0.5) | 1.5 | (0.9) |  |  |  |  |  | 3.2 |  |  |  |  |
Promissory note received |  |  |  |  |  |  |  |  |  |  |  |  | 15.0 |
Interest payable rate |  |  |  |  |  |  |  |  |  |  |  |  | 2.75% |
Aggregate cash received | 0 | 15.6 | 0 |  |  |  |  |  |  | 15.6 |  | 11.8 |  |
Litigation settlement gains |  | 14.7 |  |  |  |  |  |  |  |  |  |  |  | 14.7
Collection of real-estate related note receivable | $ 3.0 | $ 0 | $ 15.0 |  |  |  |  |  |  |  | $ 15.0 |  |  |

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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition The difference between the carrying value and the sale price of an investment. A gain would be recognized when the sale price of the investment is greater than the carrying value of the investment. This element refers to the Gain included in earnings and not to the cash proceeds of the sale. + References No definition available. + Details
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- Definition Amount of operating dividend and interest income, including amortization and accretion of premiums and discounts, on securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24721-111560 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 2, 3 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.2,3) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The percentage points (also referred to as 'margin') added to the reference rate as stated in the loan agreement and used to compute the variable rate on the loans receivable. For instance, the loan agreement might state that the interest rate the borrower is obligated to pay is the London Interbank Offered Rate (LIBOR) plus three quarters (3/4) of a percentage point adjusted quarterly (each three months). LIBOR in this example is the index or reference rate, 3/4 percentage point is the margin, the reference rate plus the margin is the fully indexed rate. This element would be used to report separately the margin. + References No definition available. + Details
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- Definition The cash inflow associated with the sale of equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 + Details
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- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References No definition available. + Details
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