Retirement Plans (Details 7)	12 Months Ended
Dec. 31, 2011
United States Pension Plan Assets Defined Benefit [Member]
Target allocation ranges
Debt securities range minimum	26.00%
Debt securities range maximum	34.00%
Real estate range minimum	9.00%
Real estate range maximum	15.00%
United States Pension Plan Assets Defined Benefit [Member] \| Domestic Equity Securities [Member]
Target allocation ranges
Equity securities range minimum	27.00%
Equity securities range maximum	41.00%
United States Pension Plan Assets Defined Benefit [Member] \| International Equity Securities [Member]
Target allocation ranges
Equity securities range minimum	11.00%
Equity securities range maximum	22.00%
United States Pension Plan Assets Defined Benefit [Member] \| Private Equity Partnerships [Member]
Target allocation ranges
Other range minimum	5.00%
Other range maximum	11.00%
United States Pension Plan Assets Defined Benefit [Member] \| Hedge Funds [Member]
Target allocation ranges
Other range minimum	0.00%
Other range maximum	7.00%
Foreign Pension Plans Defined Benefit [Member]
Target allocation ranges
Equity securities range minimum	25.00%
Equity securities range maximum	70.00%
Debt securities range minimum	30.00%
Debt securities range maximum	60.00%
Real estate range minimum	3.00%
Real estate range maximum	17.00%

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Target allocation maximum percentage of investments in debt securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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- Definition

Target allocation minimum percentage of investments in debt securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

+ 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(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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)(i)

-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)(i)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

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Target allocation maximum percentage of investments in equity securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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+ References

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Target allocation maximum percentage in other than debt securities, equity securities, and real estate to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

+ References

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Target allocation minimum percentage in other than debt securities, equity securities, and real estate to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

+ References

No definition available.

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Target allocation maximum percentage of investments in real estate to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

+ References

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Target allocation minimum percentage of investments in real estate to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.

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