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Postretirement Benefit Plans (Weighted-Average Asset Allocation By Investment Category) (Details) | Dec. 31, 2021 | Dec. 31, 2020
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Scottdale Defined Benefit Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, Weighted-average asset allocation percent | 100.00% | 100.00%
Scottdale Defined Benefit Pension Plan [Member] | Cash and Cash Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, Weighted-average asset allocation percent | 12.64% | 10.57%
Scottdale Defined Benefit Pension Plan [Member] | Common Stock [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, Weighted-average asset allocation percent | 60.75% | 58.45%
Scottdale Defined Benefit Pension Plan [Member] | Corporate Bonds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, Weighted-average asset allocation percent | 26.61% | 30.98%
Riverview Defined Benefit Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, Weighted-average asset allocation percent | 100.00% |
Riverview Defined Benefit Plan [Member] | Equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, Weighted-average asset allocation percent | 41.14% |
Riverview Defined Benefit Plan [Member] | Fixed Income [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, Weighted-average asset allocation percent | 57.38% |
Riverview Defined Benefit Plan [Member] | Cash and Cash Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Defined benefit plan, Weighted-average asset allocation percent | 1.48% |

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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=123447040&loc=d3e1928-114920 + Details
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