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For an unclassified balance sheet, amount of receivables arising from transactions with related parties.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

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Disclosure of the difference in values (gain (loss)) between the nonmonetary assets or liabilities exchanged with another entity inclusive of boot (small monetary consideration).

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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The number of real estate properties, buildings or undeveloped land parcels sold during the period.

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The cash inflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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Related Parties (Narrative) (Details) $ in Millions		1 Months Ended			12 Months Ended
Related Parties (Narrative) (Details) $ in Millions	Sep. 30, 2016 USD ($)	Oct. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Feb. 29, 2016 USD ($) center	Dec. 31, 2018 USD ($) property	Dec. 31, 2017 USD ($) property	Dec. 31, 2016 USD ($)
Related Party Transaction [Line Items]
Net accounts receivable, related parties					$ 0.5	$ 2.0
Accounts payable and accrued expenses, related parties					0.7	0.4
Joint venture fee income					$ 6.1	$ 6.2	$ 5.1
Proceeds from business acquisition				$ 2.5
Number of centers sold				1	22
Unconsolidated Real Estate Joint Venture [Member]
Related Party Transaction [Line Items]
Number of centers sold \| property						2
Series of Individually Immaterial Business Acquisitions [Member]
Related Party Transaction [Line Items]
Percentage of voting interest acquired	50.00%		50.00%
Equity interest in joint venture	$ 13.5
Gain recognized on equity interest remeasured to fair value			$ 9.0
Business Combination Achieved in Stages [Member]
Related Party Transaction [Line Items]
Percentage of voting interest acquired				49.00%
Gain recognized on equity interest remeasured to fair value				$ 37.4
Distribution of Nonmonetary Assets to Groups of Stockholders’ in Lieu of Capital Return Cash Distributions [Member] \| Unconsolidated Real Estate Joint Venture [Member]
Related Party Transaction [Line Items]
Gain recognized with the remeasurment of a land parcel		$ 1.9