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Real Estate (Real Estate Available and Held for Sale) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($) property	Sep. 30, 2015 USD ($)
Net Lease
Real Estate Properties [Line Items]
Real estate properties transferred | property	1
Executed Contract with Third Party | Net Lease
Real Estate Properties [Line Items]
Property transferred to held for sale, carrying value	$ 0.7	$ 8.2
Executed Contract with Third Party | Commercial Operating Properties
Real Estate Properties [Line Items]
Real estate properties transferred | property	1
Property transferred to held for sale, carrying value	$ 16.1
Executed Contract with Third Party | Residential Operating Properties
Real Estate Properties [Line Items]
Property transferred to held for sale, carrying value	$ 0.8
Change in Business Strategy | Commercial Operating Properties
Real Estate Properties [Line Items]
Property transferred to held for sale, carrying value		$ 2.9

X

- Definition

Number of Real Estate Properties Transferred to Held for Sale

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X

- Definition

Property Transferred to Held for Sale, Aggregate, Carrying Value

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- Definition

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.

+ References

No definition available.

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- Details

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X

- Details

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X

- Details

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X

- Details

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