Shareholders' Equity - Narrative (Details) - USD ($)	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Jun. 29, 2021
Class of Stock [Line Items]
Net proceeds available	$ 294,685,000
Net proceeds from equity offering	$ 261,943,000	$ 216,002,000
Forward price (dollars per share)	$ 95.23
Shelf Registration Statement
Class of Stock [Line Items]
Debt and equity securities authorized for issuance			$ 5,000,000,000
Debt and equity securities authorized for issuance value remaining	$ 3,200,000,000
At-The-Market
Class of Stock [Line Items]
Equity available for issuance	$ 499,700,000		$ 1,000,000,000
Forward sales equity agreement (in shares)	2,712,043
Net proceeds available	$ 260,200,000
Stock issued during period, new issues (in shares)	2,689,327
Net proceeds from equity offering	$ 261,900,000