Stockholders' Equity (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2018
Class of Stock [Line Items]
Equity Securities Registered, Value		$ 500.0
Common Stock, Shares Authorized	$ 394.3
At-the-market Equity Offering Program, Common Stock Available for Issuance	$ 100.0
At-the-market Equity Offering Program, Common Stock Issued	0