Stockholders' Equity (Details) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2019 USD ($) $ / shares shares
Class of Stock [Line Items]
Equity Securities Registered, Value	$ 500.0
Shares Issued, Price Per Share | $ / shares	$ 17.50
Common Stock Available for Issuance, Value Remaining	$ 394.3
Common Stock [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, New Issues | shares	6.0