Annual report pursuant to Section 13 and 15(d)

Related Party Transactions - Schedule of Related Party Receivable and Payables Balances (Parenthetical) (Details)

v3.20.2
Related Party Transactions - Schedule of Related Party Receivable and Payables Balances (Parenthetical) (Details) - Stack's Bowers Galleries
$ in Millions
12 Months Ended
Jun. 30, 2020
USD ($)
loan
Jun. 30, 2019
USD ($)
Related Party Transaction [Line Items]    
Number of credit lines | loan 2  
Offset amount $ 0.7  
September 19, 2017 Loan Agreement    
Related Party Transaction [Line Items]    
Short term loan receivable 0.7 $ 6.4
March 1, 2018 Loan Agreement    
Related Party Transaction [Line Items]    
Short term loan receivable $ 8.0 $ 7.5