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Retirement Benefit Plans (Wieghted Average Asset Allocations) (Details) (Pension Plans, Defined Benefit) | Dec. 31, 2012 | Dec. 31, 2011
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Hourly Employees’ Pension Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations as a percentage of plan assets | 100.00% | 100.00%
Hourly Employees’ Pension Plan | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations as a percentage of plan assets | 55.00% | 56.00%
Hourly Employees’ Pension Plan | Debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations as a percentage of plan assets | 38.00% | 38.00%
Hourly Employees’ Pension Plan | Short-term investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations as a percentage of plan assets | 2.00% | 1.00%
Hourly Employees’ Pension Plan | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations as a percentage of plan assets | 5.00% | 5.00%
Employees’ Retirement Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations as a percentage of plan assets | 100.00% | 100.00%
Employees’ Retirement Plan | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations as a percentage of plan assets | 55.00% | 56.00%
Employees’ Retirement Plan | Debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations as a percentage of plan assets | 38.00% | 38.00%
Employees’ Retirement Plan | Short-term investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations as a percentage of plan assets | 2.00% | 1.00%
Employees’ Retirement Plan | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations as a percentage of plan assets | 5.00% | 5.00%

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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: 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=21915506&loc=d3e2446-114920 Reference 2: 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=21915506&loc=d3e1928-114920 Reference 3: 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. + Details
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