For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 14

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 16

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558

+ Details

- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References+ Details

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References+ Details

Derivatives and Fair Value Measurements (Details 3) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 Explosives Hedge Contracts Member	Sep. 30, 2012 Diesel Fuel Hedge Contracts [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Foreign Exchange Contract [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Foreign Exchange Contract [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Commodity Contract [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Commodity Contract [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Level 1[Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 1[Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Level 1[Member] Foreign Exchange Contract [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 1[Member] Foreign Exchange Contract [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Level 1[Member] Commodity Contract [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 1[Member] Commodity Contract [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Level 2 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 2 [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Level 2 [Member] Foreign Exchange Contract [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 2 [Member] Foreign Exchange Contract [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Level 2 [Member] Commodity Contract [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 2 [Member] Commodity Contract [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 3 [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Level 3 [Member] Foreign Exchange Contract [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 3 [Member] Foreign Exchange Contract [Member]	Sep. 30, 2012 Fair Value, Measurements, Recurring [Member] Level 3 [Member] Commodity Contract [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Level 3 [Member] Commodity Contract [Member]
Fair value of financial asset (liability) positions measured on a recurring basis
Investment in debt and equity securities												$ 67,300,000	$ 83,500,000					$ 0	$ 0					$ 0	$ 0
Available-for-sale Securities						67,300,000	83,500,000
Derivative assets (liabilities), at fair value, net				(5,900,000)	30,900,000			511,700,000	490,600,000	25,000,000	33,000,000			0	0	0	0			511,700,000	490,600,000	25,000,000	33,000,000			0	0	0	0
Total net financial assets						604,000,000	607,100,000					67,300,000	83,500,000					536,700,000	523,600,000					0	0
Fair value, level 1 to level 2 transfers, amount	0	0	0
Fair value, level 2 to level 1 transfers, amount	$ 0	$ 0	$ 0