Impairments (Details) $ in Millions	3 Months Ended
Mar. 31, 2016 USD ($) property	Mar. 31, 2015 USD ($) property
Impairments
Total Provisions for impairment \| $	$ 1.9	$ 2.1
Number of impaired properties held-for-sale	1
Number of impaired properties held-for-investment	1
Number of impaired properties sold	6	2
Number of impaired properties disposed from other than sale		1
Automotive parts
Impairments
Number of properties impaired	1
Convenience stores
Impairments
Number of properties impaired	1
Furniture Stores
Impairments
Number of properties impaired	1
Health and fitness
Impairments
Number of properties impaired	1
Restaurants - casual dining industry
Impairments
Number of properties impaired	2
Other non-reportable segments
Impairments
Number of properties impaired	2

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2420-110228

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

Name:	us-gaap_AssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration