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Shareholders' Equity (Details) - USD ($)
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Class of Stock [Line Items]    
Gross proceeds $ 420,000,000 $ 0
Liquidation preference per share (in dollars per share) $ 25,000  
Preferred Shares    
Class of Stock [Line Items]    
Shares issued 16,800  
Interest rate 6.625%  
Shares issued (price per share) $ 25,000  
Gross proceeds $ 420,000,000  
Depositary shares 16,800,000  
Net cash proceeds 406,000,000  
Issuance costs 14,000,000  
Liquidation preference per share (in dollars per share) $ 25,000  
Redemption price per Preferred Share $ 25,000  
Common Shares issued upon conversion 2,773.200  
Redemption price after credit rating downgrade | Preferred Shares    
Class of Stock [Line Items]    
Redemption price per Preferred Share $ 25,500