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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Related Party Transaction [Line Items]        
Cash distribution, related parties $ 6.4   $ 6.4  
Percentage of tax savings owed to related party 85.00%   85.00%  
Accounts receivable        
Related Party Transaction [Line Items]        
Accounts receivable, related parties $ 0.1   $ 0.1  
Accounts payable        
Related Party Transaction [Line Items]        
Accounts payable, related parties 1.7   1.7  
Other liabilities        
Related Party Transaction [Line Items]        
Tax receivable agreement, related parties 10.9   10.9  
Other current liabilities        
Related Party Transaction [Line Items]        
Other current liabilities, related parties 5.3   5.3  
Allocated expense | Selling, general and administrative expenses        
Related Party Transaction [Line Items]        
Expenses from transactions with related party   $ 3.2   $ 5.5
Separation costs | Selling, general and administrative expenses        
Related Party Transaction [Line Items]        
Expenses from transactions with related party 0.3 $ 1.7 1.8 $ 2.9
Master services agreement fees | Selling, general and administrative expenses        
Related Party Transaction [Line Items]        
Expenses from transactions with related party 0.5   1.0  
Share-based payment arrangement | Selling, general and administrative expenses        
Related Party Transaction [Line Items]        
Expenses from transactions with related party $ 0.8   $ 1.9