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Retirement Benefit Plans (Weighted Average Asset Allocations) (Details) - Pension Plan | Dec. 31, 2020 | Dec. 31, 2019
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Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations as a percentage of plan assets | 100.00% | 100.00%
Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations as a percentage of plan assets | 56.00% | 56.00%
Debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations as a percentage of plan assets | 38.00% | 37.00%
Short-term investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations as a percentage of plan assets | 2.00% | 2.00%
Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations as a percentage of plan assets | 4.00% | 5.00%

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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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