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Retirement Benefit Plans (Percentage and Target Allocations) (Details) | Dec. 31, 2020 | Dec. 31, 2019
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Defined Benefit Plan Disclosure [Line Items] |  |
Plan Assets | 100.00% | 100.00%
Cash And Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan Assets | 0.00% | 0.00%
Cash And Equivalents [Member] | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 0.00% | 0.00%
Cash And Equivalents [Member] | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 5.00% | 5.00%
Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan Assets | 49.00% | 49.00%
Fixed Income Securities [Member] | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 41.00% | 41.00%
Fixed Income Securities [Member] | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 57.00% | 57.00%
Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan Assets | 44.00% | 43.00%
Equity Securities [Member] | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 35.00% | 35.00%
Equity Securities [Member] | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 51.00% | 51.00%
Real Assets Fund [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Plan Assets | 7.00% | 8.00%
Real Assets Fund [Member] | Minimum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 0.00% | 0.00%
Real Assets Fund [Member] | Maximum [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation | 12.00% | 12.00%

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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Percentage of actual investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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