Notes Payable - Unsecured Senior Notes (Details) - Unsecured Senior Notes $ in Millions	6 Months Ended
Jun. 30, 2021 USD ($) tranch
Debt Instrument [Line Items]
Debt amount	$ 1,000
Number of tranches \| tranch	5
Minimum fixed charge coverage ratio	1.50
Minimum
Debt Instrument [Line Items]
Minimum unencumbered interest coverage ratio	1.75
Maximum
Debt Instrument [Line Items]
Secured leverage ratio	40.00%
Leverage ratio	60.00%
4.09% Senior Notes, Unsecured
Debt Instrument [Line Items]
Debt amount	$ 100
Interest rate	4.09%
3.91% Senior Notes, Unsecured
Debt Instrument [Line Items]
Debt amount	$ 250
Interest rate	3.91%
3.78% Senior Notes, Unsecured
Debt Instrument [Line Items]
Debt amount	$ 125
Interest rate	3.78%
3.86% Senior Notes, Unsecured
Debt Instrument [Line Items]
Debt amount	$ 250
Interest rate	3.86%
3.95% Senior Notes, Unsecured
Debt Instrument [Line Items]
Debt amount	$ 275
Interest rate	3.95%

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Debt Instrument, Covenant Compliance, Secured Leverage Ratio

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Debt Instrument, Covenant Compliance, Unencumbered Interest Coverage Ratio

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

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