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Retirement Benefits - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Mar. 31, 2020 employee
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Contributions by employer |  |  | $ 3,000 |  |
Participants affected due to plan freeze (fewer than) | employee |  |  |  |  | 60
Funded percentage | 110.00% |  | 110.00% |  |
Defined benefit plan, assets | $ 93,400 |  | $ 93,400 |  |
Defined benefit plan, liability | 84,800 |  | 84,800 |  |
Other (Income) Expense Net |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Settlement loss recognized |  | $ 500 | 700 | $ 500 |
Reduction in net periodic benefit cost |  |  | 1,000 |  |
Pension Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Expected contribution for next fiscal year | 3,000 |  | 3,000 |  |
Other Postretirement Benefits |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Expected contribution for next fiscal year |  | 1,100 |  | 1,100 |
Reduction in net periodic benefit cost | $ (175) | $ (194) | $ (525) | $ (581) |

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