Investments in Partnerships Dispositions (Details) $ in Millions	1 Months Ended
Sep. 30, 2017 USD ($)
Dispositions [Line Items]
Gain (Loss) on Disposition of Assets	$ 13.4
Gain (Loss) on Disposition of Other Assets	6.7
Proceeds from Real Estate and Real Estate Joint Ventures	$ 30.3

Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2443-110228

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration