Capital and Financing Transactions - Mortgage Notes Payable (Details) $ in Millions	3 Months Ended
Mar. 31, 2016 USD ($)
Debt Instrument [Line Items]
Construction loan payable balance	$ 37.2
Hayden Ferry Lakeside III \| Fund II
Debt Instrument [Line Items]
Proceeds from construction loans	5.8
Mortgages
Debt Instrument [Line Items]
Mortgage notes payable	1,200.0
Unamortized net premiums on debt	16.5
Unamortized debt issuance expense	$ 2.6
Weighted average interest rate (as a percent)	4.00%

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Amount, after accumulated amortization, of debt premium.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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This element represents the current and noncurrent portions of a long-term real estate loan with an initial maturity beyond one year or beyond the normal operating cycle, if longer, to finance building costs. The funds are disbursed as needed or in accordance with a prearranged plan; generally, a portion of the funds is disbursed at inception and the remainder as construction progresses. The money is repaid on completion of the project (generally one to seven years), usually from the proceeds of a mortgage loan. The rate is normally higher than the prime rate, and there is usually an origination fee. The effective yield on these loans tends to be high, and the lender has a security interest in the real property.

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The cash inflow from borrowings to finance the cost of construction.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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