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Pension and Other Postretirement Benefits - Schedule of Weighted-average Assumptions Used to Determine Benefit Obligation (Details)
Jun. 30, 2018
Jun. 30, 2017
Aug. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Discount rate     3.57%
Rate of compensation increase 3.44% 3.50%  
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.32% 3.92%  
Other Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Discount rate 4.32% 3.89%