Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2018
Income Taxes [Line Items]
Effective Tax Rate	24.10%	24.90%	78.90%	22.30%
Valuation Allowance	$ 57.7		$ 57.7
First Installment of AMT Credit Refunds Received	42.5		42.5
Accelerated AMT Credit Refund Received Under CARES Act	$ 42.5		$ 42.5
Alternative Minimum Tax Credit [Member]
Income Taxes [Line Items]
Tax Credit Carryforwards					$ 85.0