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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Jan. 31, 2020
Sep. 30, 2018
Income Taxes [Line Items]            
Effective Tax Rate (53.20%) 24.70% 139.90% 21.40%    
Valuation Allowance $ 56.8   $ 56.8      
AMT Credit Refund Received         $ 42.5  
Alternative Minimum Tax Credit [Member]            
Income Taxes [Line Items]            
Tax Credit Carryforwards           $ 85.0
Other Current Assets [Member]            
Income Taxes [Line Items]            
Income Taxes Receivable $ 42.5   $ 42.5