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Retirement benefits (Details 2) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Pension benefits |  |  |
Weighted-average asset allocation |  |  |
Equity securities (as a percent) | 68.00% | 71.00% |
Fixed income (as a percent) | 32.00% | 29.00% |
Total weighted-average asset allocation (as a percent) | 100.00% | 100.00% |
Asset category, Target |  |  |
Equity securities, Target (as a percent) | 70.00% | 70.00% |
Equity securities, target minimum range (as a percent) | 65.00% | 65.00% |
Equity securities, target maximum range (as a percent) | 75.00% | 75.00% |
Fixed income securities, Target (as a percent) | 30.00% | 30.00% |
Fixed income securities, target minimum range (as a percent) | 25.00% | 25.00% |
Fixed income securities, target maximum range (as a percent) | 35.00% | 35.00% |
Total target (as a percent) | 100.00% | 100.00% |
Benefit obligation |  |  |
Discount rate (as a percent) | 5.19% | 5.68% | 6.50%
Rate of compensation increase (as a percent) | 3.50% | 3.50% | 3.50%
Net periodic benefit cost (years ended) |  |  |
Discount rate (as a percent) | 5.68% | 6.50% | 6.625%
Expected return on plan assets (as a percent) | 8.00% | 8.25% | 8.25%
Rate of compensation increase (as a percent) | 3.50% | 3.50% | 3.50%
Expected rate of return on plan assets for 2012 (as a percent) | 7.75% |  |
Other benefits |  |  |
Weighted-average asset allocation |  |  |
Equity securities (as a percent) | 69.00% | 70.00% |
Fixed income (as a percent) | 31.00% | 30.00% |
Total weighted-average asset allocation (as a percent) | 100.00% | 100.00% |
Asset category, Target |  |  |
Equity securities, Target (as a percent) | 70.00% | 70.00% |
Equity securities, target minimum range (as a percent) | 65.00% | 65.00% |
Equity securities, target maximum range (as a percent) | 75.00% | 75.00% |
Fixed income securities, Target (as a percent) | 30.00% | 30.00% |
Fixed income securities, target minimum range (as a percent) | 25.00% | 25.00% |
Fixed income securities, target maximum range (as a percent) | 35.00% | 35.00% |
Total target (as a percent) | 100.00% | 100.00% |
Benefit obligation |  |  |
Discount rate (as a percent) | 4.90% | 5.60% | 6.50%
Net periodic benefit cost (years ended) |  |  |
Discount rate (as a percent) | 5.60% | 6.50% | 6.50%
Expected return on plan assets (as a percent) | 8.00% | 8.25% | 8.25%
Rate of compensation increase (as a percent) |  |  | 3.50%
Assumed health care trend rates in next fiscal year and future years |  |  |
Assumed health care trend rate for medical in next fiscal year (as a percent) | 8.50% | 9.00% |
Assumed health care trend rate for grading down in 2019 and thereafter (as a percent) | 5.00% | 5.00% |
Assumed health care trend rate for dental in next fiscal year (as a percent) | 5.00% | 5.00% |
Assumed health care trend rate for vision in next fiscal year (as a percent) | 4.00% | 4.00% |

X
- Definition An assumption for the next fiscal year as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References No definition available. + Details
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- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the dental plan under the defined benefit plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References No definition available. + Details
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- Definition The assumed health care cost trend rate that will be graded down to and used for the 8th fiscal year and thereafter to measure the expected cost of benefits covered by the medical plan under the defined benefit plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References No definition available. + Details
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- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the medical plan under the defined benefit plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References No definition available. + Details
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- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the vision plan under the defined benefit plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References No definition available. + Details
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- Definition The aggregate allocation percentage of investments (categorized by debt securities, equity securities, real estate and other plan assets) as of the latest statement of financial position. + References No definition available. + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j -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 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j -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 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j -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 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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