Indebtedness (Mortgage Loans and Unsecured Notes) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Aggregate notional amount	$ 96.2	$ 98.9
Mortgages [Member]
Debt Instrument [Line Items]
Maturity date range, start	Jan. 01, 2018
Maturity date range, end	Dec. 31, 2033
Net book value of collateralized real estate properties	$ 491.7
Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Percentage bearing fixed interest, amount	2,562.1
Aggregate notional amount	$ 96.2
Fixed Rate Debt [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Effective interest rate	3.00%
Fixed Rate Debt [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Effective interest rate	4.84%
Mortgage Loans and Unsecured Notes [Member]
Debt Instrument [Line Items]
Weighted average remaining life	5 years 6 months

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

Debt Instrument, Weighted Average Remaining Term

+ References

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- Definition

Net Book Value of Collateralized Real Estate Properties

+ References

No definition available.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

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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.

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- Definition

Latest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

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Earliest date the outstanding debt instruments are required to be repaid, in CCYY-MM-DD format.

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- Definition

The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

+ References

No definition available.

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