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Retirement Benefits - Postretirement benefit plans - expected future benefit payments (Details) - Other Postretirement Benefit Plans, Defined Benefit
$ in Thousands
Jun. 30, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Estimated future benefit payments in the year ending June 30, 2020 $ 5,308
Estimated future benefit payments in the year ending June 30, 2021 5,051
Estimated future benefit payments in the year ending June 30, 2022 4,675
Estimated future benefit payments in the year ending June 30, 2023 4,401
Estimated future benefit payments in the year ending June 30, 2024 4,212
Estimated future benefit payments in the aggregate for the five years ending June 30, 2025 through June 30, 2029 $ 18,271