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Related Party Transactions (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 04, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
May 23, 2019
Owner            
Related Party Transaction [Line Items]            
Ownership threshold for voting rights           9.50%
RSL and RSI | RSL and RSI | Service Agreement            
Related Party Transaction [Line Items]            
Expenses incurred under services agreements   $ 0.2 $ 1.0 $ 0.4 $ 4.2  
RSL | RSL | Share-based Compensation, Expense Allocated to Company            
Related Party Transaction [Line Items]            
Expenses incurred under services agreements   $ 0.1 $ 0.2 $ 0.1 $ 0.4  
Public Offering            
Related Party Transaction [Line Items]            
Number of shares issued (in shares) 17,424,243          
Price of shares (in USD per share) $ 8.25          
Net proceeds from sale of shares $ 134.5          
Public Offering | RSL            
Related Party Transaction [Line Items]            
Number of shares issued (in shares) 2,424,242          
Net proceeds from sale of shares $ 20.0          
Maximum | RSL            
Related Party Transaction [Line Items]            
Ownership threshold for appointment of directors           50.00%
Minimum | RSL            
Related Party Transaction [Line Items]            
Ownership threshold for appointment of directors           35.00%