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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fixed interest rate related to the interest rate derivative.

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Amount of increase in the fair value of derivatives recognized in the income statement.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Debt Instrument, Weighted Average Duration of Maturity

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Proceeds from Public Offering Sale of Debt

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Public offering price as a percent of par.

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SENIOR NOTES PAYABLE AND OTHER DEBT - Narrative (Details) CAD in Thousands	1 Months Ended				3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Jul. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	May 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 CAD	May 31, 2016 CAD	Feb. 29, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 CAD
Debt instruments
Principal amount outstanding	$ 11,317,837,000				$ 11,317,837,000		$ 11,317,837,000					$ 11,271,020,000
Loss on extinguishment of debt, net					(383,000)	$ (15,331,000)	(3,165,000)	$ (14,897,000)
Derivative notional amount		$ 225,000,000									$ 200,000,000
Derivative fixed interest rate											1.132%
Derivative gain		1,900,000
Unsecured revolving credit facilities
Debt instruments
Line of credit facility, current borrowing capacity	2,000,000,000.0				2,000,000,000.0		$ 2,000,000,000.0
Debt instrument, additional period							1 year
Amount outstanding	232,400,000				232,400,000		$ 232,400,000
Letters of credit outstanding	14,100,000				14,100,000		14,100,000
Unused borrowing capacity available	1,800,000,000				1,800,000,000		1,800,000,000
Principal amount outstanding	232,405,000				232,405,000		$ 232,405,000					180,683,000
Unsecured revolving credit facilities \| LIBOR
Debt instruments
Debt instrument, basis spread on variable rate							1.00%
Unsecured Term Loan Due 2018
Debt instruments
Line of credit facility, current borrowing capacity	200,000,000.0				200,000,000.0		$ 200,000,000.0
Debt instrument, term of loan							4 years
Principal amount outstanding	200,000,000				200,000,000		$ 200,000,000					200,000,000
Unsecured Term Loan Due 2018 \| LIBOR
Debt instruments
Debt instrument, basis spread on variable rate							1.05%
Unsecured term loan due 2019
Debt instruments
Line of credit facility, current borrowing capacity	800,000,000.0				800,000,000.0		$ 800,000,000.0
Debt instrument, term of loan							5 years
Principal amount outstanding	373,353,000				373,353,000		$ 373,353,000					468,477,000
Repayments of debt				$ 100,000,000
Loss on extinguishment of debt, net				(400,000)
Unsecured term loan due 2020
Debt instruments
Debt instrument, basis spread on variable rate							97.50%
Principal amount outstanding	900,000,000				900,000,000		$ 900,000,000					900,000,000
Unsecured Debt
Debt instruments
Line of credit facility, maximum borrowing capacity (up to)	$ 3,500,000,000.0				$ 3,500,000,000.0		$ 3,500,000,000.0
Debt instrument, face amount												20,000,000
3.125% Senior Notes due 2023
Debt instruments
Principal amount outstanding \| CAD									CAD 400,000	CAD 400,000			CAD 0
Interest rate	3.125%				3.125%		3.125%		3.125%	3.125%
Public offering price as percent of par			100.335%							99.343%
Proceeds from public offering sale of debt				$ 397,400,000
Loss on extinguishment of debt, net			$ 2,100,000
1.55% Senior Notes due 2016
Debt instruments
Principal amount outstanding	$ 0				$ 0		$ 0					$ 550,000,000
Repayments of debt		94,500,000.0	$ 455,500,000
Interest rate	1.55%				1.55%		1.55%		1.55%			1.55%	1.55%
Loss on extinguishment of debt, net		$ (300,000)
3.25% Senior Notes due 2026
Debt instruments
Principal amount outstanding	$ 450,000,000				$ 450,000,000		$ 450,000,000		CAD 450,000			$ 0
Interest rate	3.25%				3.25%		3.25%		3.25%
Public offering price as percent of par	99.811%				99.811%		99.811%		99.811%
Proceeds from public offering sale of debt	$ 449,100,000
Mortgages
Debt instruments
Loss on extinguishment of debt, net							$ (400,000)
Debt instrument, face amount	$ 254,700,000				$ 254,700,000		$ 254,700,000
Weighted average maturity (in years)							2 years 1 month