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Common Shares (Narrative) (Details) - USD ($) shares in Thousands, $ in Millions	Jun. 04, 2020	Apr. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
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			97,700
Preferred Stock, Shares Outstanding			0
Unsecured Credit Facility [Member]
Maximum borrowing capacity under unsecured credit facility			$ 900.0
2017 ATM program [Member]
Maximum aggregate offering price of common shares	$ 362.7
2017 ATM program [Member] | Subsequent Event [Member]
Maximum aggregate offering price of remaining common shares available for sale		$ 362.7
April 2007 Repurchase Plan [Member]
Treasury stock allowed for repurchase			$ 500.0
April 2007 Repurchase Plan [Member] | Subsequent Event [Member]
Share Repurchase Program, Remaining Authorized Repurchase Amount		$ 269.5

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The maximum number of common shares and nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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