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Real Estate (Impairments) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) property
Property, Plant and Equipment [Line Items] |  |  |
Impairment of real estate | $ | $ 11.9 | $ 10.7 | $ 5.9
Commercial Operating Properties |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of properties impaired |  |  | 2
Residential Operating Properties |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of properties impaired |  |  | 1

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- Definition The charge against earnings in the period to reduce the carrying amount of real property to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2921-110230 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Details
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- Details
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