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Other Equity Matters Preferred Shares (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2019
Mar. 31, 2019
Class of Stock [Line Items]          
Issuance of preferred shares, net of underwriting discount $ 392,242,000 $ 0 $ 0    
Preferred Stock, Redemption Price Per Share $ 25.00        
Preferred Stock, Liquidation Preference, Value $ 405,000,000        
Preferred Stock, Liquidation Preference Per Share $ 16,200,000,000        
8.50% Series A Cumulative Redeemable Perpetual Preference Shares          
Class of Stock [Line Items]          
Preferred Units, Offering Costs $ 2,700,000        
Preferred Stock, Liquidation Preference, Value         $ 86,250,000
Preferred Stock, Liquidation Preference Per Share         $ 3,450,000,000
8.00% Series B Cumulative Redeemable Perpetual Preference Shares          
Class of Stock [Line Items]          
Preferred Units, Offering Costs 4,600,000        
Preferred Stock, Liquidation Preference, Value       $ 143,750,000  
Preferred Stock, Liquidation Preference Per Share       $ 5,750,000,000  
7.375% Series C Cumulative Redeemable Perpetual Preference Shares          
Class of Stock [Line Items]          
Preferred Units, Offering Costs 5,500,000        
Preferred Stock, Liquidation Preference, Value $ 175,000,000        
Preferred Stock, Liquidation Preference Per Share $ 7,000,000,000        
Preferred Stock [Member]          
Class of Stock [Line Items]          
Cumulative Dividends $ 1,300,000