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Shareholders' Equity (Narrative) (Details)
 3 Months Ended 9 Months Ended
Feb. 04, 2023
$ / shares
Feb. 03, 2023
$ / shares
Sep. 30, 2023
USD ($)
$ / shares
Sep. 30, 2022
USD ($)
$ / shares
Sep. 30, 2023
USD ($)
board_member
dividend
$ / shares
Sep. 30, 2022
USD ($)
$ / shares
Stockholders' Equity Note [Abstract]            
Number of quarterly dividends in arrearage before preferred shareholders can elect additional board members | dividend         6  
Number of additional board members the preferred shareholders can elect in the case of an excess arrearage of quarterly dividends | board_member         2  
Amount of preferred dividends in arrears | $         $ 0  
Affirmative vote of outstanding shares of a series of Preferred Shares required for any material and adverse amendment to the terms of series, percent         66.67%  
Affirmative vote of outstanding shares of all Preferred Shares, voting as a single class, required to issue shares ranking senior to Preferred Shares, percent         66.67%  
Redemption price per share (in USD per share)     $ 25.00   $ 25.00  
Increase in regular common dividend 50.00%          
Common stock, quarterly dividends (in USD per share) $ 3.00 $ 2.00        
Common stock, annual dividends (in USD per share) $ 12.00 $ 8.00        
Common stock dividends paid in aggregate | $     $ 527,600,000 $ 2,700,000,000 $ 1,600,000,000 $ 3,400,000,000
Distributions to common shareholders and restricted share unitholders (in USD per share)     $ 3.00 $ 15.15 $ 9.00 $ 19.15
Preferred share dividends | $     $ 48,700,000 $ 48,700,000 $ 146,000,000 $ 145,700,000