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Common Shares (Narrative) (Details) - USD ($)
 2 Months Ended 12 Months Ended
Feb. 17, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Aug. 31, 2021
Number of common and preferred stock authorized to issue   185,000,000      
Common shares, authorized   175,000,000 175,000,000    
Preferred shares, authorized   10,000,000      
Common Stock, Shares, Outstanding   103,300,000      
Preferred Stock, Shares Outstanding   0      
Common shares issued   5,416 0 3,599  
Common shares issued   $ 759,209,000 $ 0 $ 353,213,000  
Cash distributions declared to equity holders per share   $ 3.32 $ 3.32 $ 3.20  
2020 ATM program [Member]          
Maximum aggregate offering price of common shares   $ 362,700,000      
Stock Repurchase Program, Remaining Authorized Repurchase Amount         $ 200,000
Common shares issued   2,900,000      
Total net consideration   $ 358,800,000      
Shares Issued, Price Per Share   $ 126.64      
2021 ATM program          
Maximum aggregate offering price of common shares   $ 500,000,000      
Common shares issued   2,600,000      
Total net consideration   $ 400,400,000      
Shares Issued, Price Per Share   $ 157.57      
Subsequent Event [Member]          
Cash distributions declared to equity holders per share $ 0.94        
April 2007 Repurchase Plan [Member]          
Stock Repurchase Program, Authorized Amount   $ 500,000,000      
April 2007 Repurchase Plan [Member] | Subsequent Event [Member]          
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 269,500,000