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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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