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Share-Based Compensation - Cash-Settled Plans, Narrative (Details)
12 Months Ended
Jan. 08, 2019
Jun. 30, 2021
installment
shares
Jun. 30, 2020
shares
Dec. 29, 2017
$ / shares
Cash-Settled Phantom Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share price (dollars per share) | $ / shares       $ 4.76
RSUs outstanding | shares   0 0  
2018 Performance Incentive Plan | Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of vesting installments | installment   3    
Vesting period   3 years    
2018 Performance Incentive Plan | Cash-Settled Phantom Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 1 year