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Retirement Benefits (Narrative) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
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Defined Benefit Plan Disclosure [Line Items] |  |
Anticipated additional contribution for pension plans and other postretirement benefit plans in 2012 | $ 6.6 |
Pension Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected contribution for next fiscal year |  | 9.4
Actual contributions | 3.6 |
Other Postretirement Benefit Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Expected contribution for next fiscal year |  | 0.9
Actual contributions | $ 0.1 |

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- Definition Additional contribution pension plans and other postretirement benefit plans. + References No definition available. + Details
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- Definition Defined Benefit Plan, Cumulative Contribution by Employer + References No definition available. + Details
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- Definition The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph g -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 (g) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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