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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 6 Months Ended
Jul. 12, 2021
Jun. 05, 2020
Jul. 19, 2021
Jun. 30, 2021
Aug. 11, 2021
Dec. 31, 2020
Subsequent Event [Line Items]            
Preference shares, par value (in dollars per share)       $ 1.00   $ 1.00
Preference shares, shares outstanding (in shares)       11,010,000   11,010,000
Common Shares            
Subsequent Event [Line Items]            
Share repurchase program, shares repurchased (in shares)       3,019,603    
Repurchase of shares       $ 480.7    
Share repurchase program, price per share (in dollars per share)       $ 159.18    
Proceeds from issuance   $ 1,100.0        
Series G Preferred Stock            
Subsequent Event [Line Items]            
Dividend rate, percentage       4.20%    
Series E Preference Shares            
Subsequent Event [Line Items]            
Dividend rate, percentage       5.375%    
Liquidation preference per annum (in dollars per share)       $ 1.34375    
Series E Preference Shares | Forecast            
Subsequent Event [Line Items]            
Preference shares, shares outstanding (in shares)         0  
Preference shares redemption value         $ 275.0  
Subsequent Event | Common Shares            
Subsequent Event [Line Items]            
Share repurchase program, shares repurchased (in shares)     920,000      
Repurchase of shares     $ 137.5      
Share repurchase program, price per share (in dollars per share)     $ 149.57      
Subsequent Event | Depositary Shares, each representing a 1/1,000th interest in a Series G 4            
Subsequent Event [Line Items]            
Shares issued (in shares) 20,000,000          
Liquidation preference per annum (in dollars per share) $ 25.00          
Proceeds from issuance $ 500.0          
Subsequent Event | Series G Preferred Stock            
Subsequent Event [Line Items]            
Preference shares, par value (in dollars per share) $ 1.00          
Liquidation preference per annum (in dollars per share) $ 25,000          
Subsequent Event | Series E Preference Shares            
Subsequent Event [Line Items]            
Preference shares, shares outstanding (in shares) 11,000,000