Benefit Plans (Targeted asset allocation of plan assets and the actual allocation of plan assets) (Details) |
Mar. 31, 2020 |
|---|---|
| Equity Securities | |
| Defined Benefit Plan Disclosure [Line Items] | |
| Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 75.00% |
| Debt Securities | |
| Defined Benefit Plan Disclosure [Line Items] | |
| Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 25.00% |