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Retirement Benefits - Narrative (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2020 employee
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributions by employer | $ 1,100 |  |
Participants affected due to plan freeze (fewer than) | employee |  |  | 60
Funded percentage | 113.00% |  |
Defined benefit plan, assets | $ 88,100 |  |
Defined benefit plan, liability | 77,800 |  |
Other (Income) Expense Net |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Settlement loss recognized | 48 | $ 300 |
Pension Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contribution for next fiscal year | $ 3,400 |  |
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contribution for next fiscal year |  | $ 1,000 |

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