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Pension and Other Postretirement Benefits - Schedule of Weighted-average Assumptions Used to Determine Net Periodic Benefit Cost (Details)
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Defined Benefit Plan Disclosure [Line Items]      
Long-term rate of compensation increase 3.39% 3.44% 3.50%
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.32% 3.92% 3.91%
Expected long-term rate of return on plan assets 6.88% 6.87% 6.88%
Other Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.32% 3.89% 3.86%
Expected long-term rate of return on plan assets 6.25% 6.25% 6.25%