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Common Shares (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 12, 2022 | Aug. 02, 2021 | Mar. 31, 2022 | Apr. 29, 2022 | Dec. 31, 2021
Number of common and preferred stock authorized to issue |  |  | 185,000 |  |
Common shares, authorized |  |  | 175,000 |  | 175,000
Preferred shares, authorized |  |  | 10,000 |  |
Common Stock, Shares, Outstanding |  |  | 103,600 |  |
Preferred Stock, Shares Outstanding |  |  | 0 |  |
1.23% Unsecured credit facility [Member] |  |  |  |  |
Maximum borrowing capacity under unsecured credit facility |  |  | $ 900,000,000 |  |
2021 ATM program |  |  |  |  |
Maximum aggregate offering price of common shares |  | $ 500,000,000 |  |  |
Stock Issued During Period, Value, New Issues |  |  | $ 26,200,000 |  |
Stock Issued During Period, Shares, New Issues |  |  | 200 |  |
AveragePricePerCommonShareSold |  |  | $ 165.01 |  |
2021 ATM program | Subsequent Event [Member] |  |  |  |  |
Maximum aggregate offering price of remaining common shares available for sale |  |  |  | $ 71,300,000 |
2022 Equity offering | Subsequent Event [Member] |  |  |  |  |
Stock Issued During Period, Value, New Issues | $ 490,300,000 |  |  |  |
Stock Issued During Period, Shares, New Issues | 2,900 |  |  |  |
April 2007 Repurchase Plan [Member] |  |  |  |  |
Treasury stock allowed for repurchase |  |  | $ 500,000,000 |  |
April 2007 Repurchase Plan [Member] | Subsequent Event [Member] |  |  |  |  |
Share Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  | $ 269,500,000 |

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