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Shareholders' Equity - Narrative (Details) - USD ($)
6 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 23, 2022
Jun. 29, 2021
Class of Stock [Line Items]        
Net proceeds available $ 451,300,000      
Net proceeds from equity issuances 594,320,000 $ 460,678,000    
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 2,200,000,000      
At-The-Market        
Class of Stock [Line Items]        
Equity available for issuance $ 1,000,000,000   $ 1,000,000,000  
Forward sales equity agreement (in shares) 7,381,043      
Net proceeds available $ 759,800,000      
Stock issued during period, new issues (in shares) 6,162,269      
Net proceeds from equity issuances $ 594,300,000