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Retirement Benefit Plans (Fair Values of Pension Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Total Assets including Common Trust Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 700,535 | $ 859,883
Level 1 [Member] | Total Assets including Common Trust Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 200,500 | 455,917
Level 2 [Member] | Total Assets including Common Trust Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 31,268 | 40,254
Pension Benefits [Member] | Cash And Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 9,050 | 21,280
Pension Benefits [Member] | Total Cash and Cash-Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 9,050 | 21,280
Pension Benefits [Member] | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 60,845 | 69,941
Pension Benefits [Member] | Mutual Fund-Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 344 | 20,428
Pension Benefits [Member] | Exchange Traded Fund (ETF)-Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 5,087 | 4,049
Pension Benefits [Member] | Total Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 66,276 | 94,418
Pension Benefits [Member] | Domestic And Foreign Stock [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 50,956 | 109,610
Pension Benefits [Member] | Mutual Funds-Equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 105,486 | 270,863
Pension Benefits [Member] | Total Equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 156,442 | 380,473
Pension Benefits [Member] | Total Real Assets At Fair Value [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 231,768 | 496,171
Pension Benefits [Member] | Common Trust Fund (Fixed Income) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 410,280 | 294,112
Pension Benefits [Member] | Common Trust Fund (Real Assets) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 58,487 | 69,600
Pension Benefits [Member] | Level 1 [Member] | Cash And Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 9,050 | 21,280
Pension Benefits [Member] | Level 1 [Member] | Total Cash and Cash-Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 9,050 | 21,280
Pension Benefits [Member] | Level 1 [Member] | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 29,577 | 29,687
Pension Benefits [Member] | Level 1 [Member] | Mutual Fund-Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 344 | 20,428
Pension Benefits [Member] | Level 1 [Member] | Exchange Traded Fund (ETF)-Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 5,087 | 4,049
Pension Benefits [Member] | Level 1 [Member] | Total Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 35,008 | 54,164
Pension Benefits [Member] | Level 1 [Member] | Domestic And Foreign Stock [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 50,956 | 109,610
Pension Benefits [Member] | Level 1 [Member] | Mutual Funds-Equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 105,486 | 270,863
Pension Benefits [Member] | Level 1 [Member] | Total Equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 156,442 | 380,473
Pension Benefits [Member] | Level 1 [Member] | Total Real Assets At Fair Value [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 200,500 | 455,917
Pension Benefits [Member] | Level 2 [Member] | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 31,268 | 40,254
Pension Benefits [Member] | Level 2 [Member] | Total Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 31,268 | 40,254
Pension Benefits [Member] | Level 2 [Member] | Total Real Assets At Fair Value [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 31,268 | $ 40,254

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- Definition Amount of investment within defined benefit plan asset category. + 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)(ii) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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