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Retirement Benefits - Postretirement benefit plans, expected future benefit payments (Details) - Other Postretirement Benefit Plans, Defined Benefit
$ in Thousands
Jun. 30, 2020
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Estimated future benefit payments in the year ending June 30, 2021 $ 6,373
Estimated future benefit payments in the year ending June 30, 2022 5,772
Estimated future benefit payments in the year ending June 30, 2023 5,256
Estimated future benefit payments in the year ending June 30, 2024 4,938
Estimated future benefit payments in the year ending June 30, 2025 4,622
Estimated future benefit payments in the aggregate for the five years ending June 30, 2026 through June 30, 2030 $ 20,172