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Retirement Plans (Schedule of Target and Actual Allocation of Plan Assets) (Details) | Dec. 31, 2019 | Dec. 31, 2018
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Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations | 100.00% |
Actual plan asset allocations | 100.00% | 100.00%
Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations | 23.00% |
Actual plan asset allocations | 22.00% | 26.00%
Debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations | 44.00% |
Actual plan asset allocations | 44.00% | 46.00%
Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target plan asset allocations | 33.00% |
Actual plan asset allocations | 34.00% | 28.00%

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