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Postretirement Benefit Plans (Details 11) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010
Domestic equities [Member] |  |
Asset allocation ranges |  |
Actual allocation | 33.00% | 25.00%
Minimum range | 30.00% | 25.00%
Maximum range | 40.00% | 75.00%
Alternative investments [Member] |  |
Asset allocation ranges |  |
Actual allocation | 0.00% | 47.00%
Minimum range | 0.00% | 20.00%
Maximum range | 0.00% | 45.00%
International equities [Member] |  |
Asset allocation ranges |  |
Actual allocation | 27.00% | 18.00%
Minimum range | 20.00% | 10.00%
Maximum range | 40.00% | 45.00%
Fixed income [Member] |  |
Asset allocation ranges |  |
Actual allocation, Fixed income | 35.00% | 2.00%
Asset allocation, Fixed income, Minimum | 25.00% | 0.00%
Asset allocation, Fixed income, Maximum | 45.00% | 60.00%
Cash and other [Member] |  |
Asset allocation ranges |  |
Actual allocation, Cash and other | 5.00% | 8.00%
Asset allocation, Cash and other, Minimum | 0.00% | 0.00%
Asset allocation, Cash and other, Maximum | 5.00% | 30.00%

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- Definition The percentage of the fair value of debt securities to the fair value of total plan assets held as of the measurement date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2446-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The percentage of the fair value of investments other than debt securities, equity securities, and real estate to the fair value of total plan assets held as of the measurement date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(1) -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e2446-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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