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Share-Based Compensation - Performance Restricted Stock Units, Narrative (Details) - Performance Restricted Stock Units - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted (in shares) 357,000 348,000 0
Fair value of vested awards $ 10.1 $ 6.3  
Vested (in shares) 0   0
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Distribution percentage of target number of Performance Stock Units   0.00%  
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Distribution percentage of target number of Performance Stock Units   200.00%