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Stock Based Compensation Stock Option Grant Date Fair Value Assumptions (Details) - Share-based Payment Arrangement, Option [Member]
12 Months Ended
Jun. 30, 2020
Rate
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expected Life 6 years 6 months
Volatility 19.60%
Risk free interest rate 1.24%
Dividend yield 1.28%