Indebtedness (Mortgage Loans and Unsecured Notes) (Details) $ in Millions	12 Months Ended
Dec. 31, 2018 USD ($)
Mortgages
Debt Instrument [Line Items]
Net book value of collateralized real estate properties	$ 478.7
Fixed Rate Debt
Debt Instrument [Line Items]
Percentage bearing fixed interest, amount	2,693.8
Aggregate notional amount	$ 66.8
Fixed Rate Debt \| Minimum
Debt Instrument [Line Items]
Effective interest rate	2.60%
Fixed Rate Debt \| Maximum
Debt Instrument [Line Items]
Effective interest rate	4.84%
Mortgage Loans and Unsecured Notes
Debt Instrument [Line Items]
Weighted average remaining life	5 years 1 month

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

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+ References

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- Definition

Net Book Value of Collateralized Real Estate Properties

+ References

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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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-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

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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.

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