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Real Estate (Real Estate Available and Held for Sale) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($) lease property	Sep. 30, 2017 USD ($) lease
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of net lease assets | lease	1	1
Operating Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties sold	6
Number of Real Estate Properties Transferred to Held for Sale	2
Property transferred to held for sale, aggregate, carrying value | $	$ 30.2	$ 0.9
Net Lease
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties sold	3

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Number of Net Lease Assets

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Number of Real Estate Properties Transferred to Held for Sale

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Property Transferred to Held for Sale, Aggregate, Carrying Value

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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