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Share-Based Compensation - Cash-Settled Performance Units, Narrative (Details) - Cash-Settled Performance Units - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of vested awards   $ 0.4 $ 0.4
Payments made to settle vested performance share units $ 0.4 $ 0.3 $ 0.3