Debt instrument maturity period.

No definition available.

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- Definition

Debt instrument maturity year.

+ References

No definition available.

+ Details

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- Definition

Number of term loans.

+ References

No definition available.

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- Definition

Settlement of Forward Swaps

+ References

No definition available.

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Balance Type:	credit
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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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
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Period Type:	instant

- Definition

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

+ References

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Period Type:	instant

- 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.

+ Details

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Period Type:	duration

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Period Type:	duration

- Definition

Description of the payment terms of the debt instrument (for example, whether periodic payments include principal and frequency of payments) and discussion about any contingencies associated with the payment.

+ References

+ Details

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

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-Publisher FASB
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Period Type:	duration

- Definition

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.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

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- Definition

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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Balance Type:	credit
Period Type:	instant

- Definition

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.

+ References

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Period Type:	instant

- Definition

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.

+ References

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 14
-Subparagraph (b)
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Balance Type:	debit
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- Definition

The cash inflow from amounts received from issuance of long-term debt that is wholly or partially secured by collateral. Excludes proceeds from tax exempt secured debt.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-SubTopic 10
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-Paragraph 15
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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Borrowings - Additional Information (Details)	1 Months Ended			9 Months Ended
Borrowings - Additional Information (Details)	Aug. 31, 2019 USD ($)	May 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2019 USD ($) Loan	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage				3.80%
Individual property mortgages				$ 645,406,000	$ 475,026,000
Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage				3.70%
Number of Term Loans \| Loan				2
Unsecured Debt [Member] \| Fixed Rate Debt Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date				Mar. 01, 2026
Debt Instrument, Face Amount				$ 3,192,000,000
Debt Instrument, Interest Rate, Effective Percentage				3.90%
Unsecured Debt [Member] \| KeyBank Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 150,000,000.0
Number of Term Loans \| Loan				1
Debt Instrument Maturity Year				2021
Unsecured Debt [Member] \| Wells Fargo Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 300,000,000.0
Debt Instrument, Interest Rate, Stated Percentage				2.32%
Number of Term Loans \| Loan				1
Debt Instrument Maturity Year				2022
Debt Instrument Maturity Period				2020-01
Repayments of Unsecured Debt		$ 300,000,000.0
Unsecured Debt [Member] \| US Bank Term Loan [Member]
Debt Instrument [Line Items]
Repayments of Unsecured Debt	$ 150,000,000.0
Secured Debt [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage				4.60%
Secured Debt [Member] \| Fixed Rate Debt Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Maturity Date				Oct. 03, 2036
Debt Instrument, Interest Rate, Effective Percentage				4.60%
Individual property mortgages				$ 648,800,000
Secured Debt [Member] \| Mortgage Maturing in February 2049 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage				4.43%
Proceeds from Loan Originations				$ 191,300,000
Secured Debt [Member] \| Mortgages [Member]
Debt Instrument [Line Items]
Repayments of Secured Debt	13,200,000
M A A L P \| Commercial Paper Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Payment Terms		397
Debt Instrument, Face Amount				$ 200,000,000.0
M A A L P \| Unsecured Debt [Member] \| Years to Maturity [Member] \| Fixed Rate Debt Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Term				6 years 4 months 24 days
M A A L P \| Unsecured Debt [Member] \| $1 Billion Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Current Borrowing Capacity		$ 1,000,000,000.0
Line of Credit Facility, Maximum Borrowing Capacity		$ 1,500,000,000
Debt Instrument, Maturity Date		May 31, 2023
Line of Credit Facility, Amount Outstanding				$ 0
Letters of Credit Outstanding, Amount				2,800,000
M A A L P \| Unsecured Debt [Member] \| Public Income Notes [Member] \| Fixed Rate Debt Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				3,000,000,000.0
M A A L P \| Unsecured Debt [Member] \| Private Placement [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				242,000,000.0
M A A L P \| Unsecured Debt [Member] \| Private Placement [Member] \| Fixed Rate Debt Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount				$ 242,000,000.0
M A A L P \| Unsecured Debt [Member] \| 3.95% Initial Notes Due 2029 [Member]
Debt Instrument [Line Items]
Debt Instrument, Payment Terms			Interest on the Initial 2029 Notes is payable on March 15 and September 15 of each year, beginning on September 15, 2019.
Debt Instrument, Face Amount			$ 300,000,000.0
Debt Instrument, Term			10 years
Debt Instrument, Interest Rate, Stated Percentage			3.95%
Debt Instrument, Redemption Price, Percentage			99.72%
Debt Issuance Costs, Gross			$ 2,800,000
Proceeds from Debt, Net of Issuance Costs			297,200,000
Settlement of Forward Swaps			$ 300,000,000.0
Debt Instrument, Interest Rate, Effective Percentage			4.24%
M A A L P \| Unsecured Debt [Member] \| 3.95% Additional Notes due 2029 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 250,000,000.0
Debt Instrument, Interest Rate, Stated Percentage	3.95%
M A A L P \| Unsecured Debt [Member] \| 2.985% Notes due 2029 [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage	107.827%
Debt Issuance Costs, Gross	$ 22,100,000
Proceeds from Debt, Net of Issuance Costs	$ 272,100,000
Debt Instrument, Interest Rate, Effective Percentage	2.985%
Minimum [Member] \| Unsecured Debt [Member] \| KeyBank Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate				0.90%
Minimum [Member] \| Unsecured Debt [Member] \| Wells Fargo Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate				0.90%
Minimum [Member] \| M A A L P \| Unsecured Debt [Member] \| Fixed Rate Debt Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Term				7 years
Minimum [Member] \| M A A L P \| Unsecured Debt [Member] \| $1 Billion Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.75%
Maximum [Member] \| Unsecured Debt [Member] \| KeyBank Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate				1.75%
Maximum [Member] \| Unsecured Debt [Member] \| Wells Fargo Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate				1.75%
Maximum [Member] \| M A A L P \| Commercial Paper Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount		$ 500,000,000.0
Maximum [Member] \| M A A L P \| Unsecured Debt [Member] \| Fixed Rate Debt Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Term				12 years
Maximum [Member] \| M A A L P \| Unsecured Debt [Member] \| $1 Billion Unsecured Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate		1.45%