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Shareholders' Equity - Narrative (Details) - USD ($)
6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Feb. 11, 2020
Class of Stock [Line Items]      
Net proceeds from equity offering $ 460,678,000 $ 258,047,000  
Net proceeds available $ 115,600,000    
Forward Price (dollars per share) $ 90.96    
Shelf Registration Statement      
Class of Stock [Line Items]      
Debt and equity securities authorized for issuance     $ 4,000,000,000.0
Debt and equity securities authorized for issuance value remaining $ 200,000,000    
At-The-Market      
Class of Stock [Line Items]      
Forward sales equity agreement (in shares) 2,472,912    
Stock issued during period, new issues (in shares) 4,537,669    
Net proceeds from equity offering $ 460,700,000    
Equity available for issuance 313,000,000    
Net proceeds available $ 238,600,000