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SENIOR NOTES PAYABLE AND OTHER DEBT - Credit Facilities, Commerical Paper and Unsecured Term Loans (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Mar. 31, 2021	Jun. 30, 2021 USD ($)	Jun. 30, 2021 CAD ($)	Dec. 31, 2020 USD ($)
Debt instruments
Commercial paper program capacity	$ 1,000,000,000.0		$ 1,000,000,000.0
Commercial paper	170,000,000		170,000,000		$ 0
Unsecured debt \| Revolving Credit Facility
Debt instruments
Maximum borrowing capacity	2,750,000,000		2,750,000,000		3,000,000,000.0
Accordion feature of debt	3,750,000,000		3,750,000,000
Fair value of amount outstanding	46,324,000		46,324,000		39,395,000
Letters of credit outstanding	24,900,000		24,900,000
Line of Credit Facility, Remaining Borrowing Capacity	2,700,000,000		$ 2,700,000,000
Unsecured debt \| Revolving Credit Facility \| LIBOR
Debt instruments
Variable interest rate		0.875%	0.825%
Unsecured Term Loan Due 2023
Debt instruments
Accordion feature of debt	800,000,000.0		$ 800,000,000.0
Unsecured debt	$ 200,000,000		200,000,000		200,000,000
Unsecured Term Loan Due 2023 \| LIBOR
Debt instruments
Variable interest rate	0.90%
Secured revolving construction credit facility due 2022 \| Revolving Credit Facility
Debt instruments
Maximum borrowing capacity	$ 400,000,000.0		400,000,000.0
Fair value of amount outstanding	43,908,000		43,908,000		154,098,000
Unsecured Term Loan due 2025
Debt instruments
Unsecured debt	$ 403,421,000		$ 403,421,000	$ 500	$ 392,773,000
Unsecured Term Loan due 2025 \| Canadian Dollar Offered Rate (CDOR)
Debt instruments
Variable interest rate	0.90%