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Common Shares (Narrative) (Details) - USD ($) |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 04, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jul. 30, 2021 | Dec. 31, 2020
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 |  | 100,600,000 |  |  |
Preferred Stock, Shares Outstanding |  | 0 |  |  |
Unsecured Credit Facility [Member] |  |  |  |  |
Maximum borrowing capacity under unsecured credit facility |  | $ 900,000,000 |  |  |
2017 ATM program [Member] |  |  |  |  |
Maximum aggregate offering price of common shares | $ 362,700,000 |  |  |  |
Stock Issued During Period, Value, New Issues |  | $ 358,800,000 |  |  |
Stock Issued During Period, Shares, New Issues |  | 2,900,000 |  |  |
AveragePricePerCommonShareSold |  |  | $ 126.64 |  |
2017 ATM program [Member] | Subsequent Event [Member] |  |  |  |  |
Maximum aggregate offering price of remaining common shares available for sale |  |  |  | $ 200,000 |
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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