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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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