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SENIOR NOTES PAYABLE AND OTHER DEBT - Credit Facilities, Commerical Paper and Unsecured Term Loans (Details) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) period	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2021 CAD ($)
Debt instruments
Commercial paper	$ 370,000,000		$ 370,000,000		$ 0
Commercial paper program capacity	1,000,000,000		1,000,000,000
Loss on extinguishment of debt	29,792,000	$ 7,386,000	56,808,000	$ 7,386,000
Unsecured debt \| Revolving Credit Facility
Debt instruments
Maximum borrowing capacity	2,750,000,000		$ 2,750,000,000		3,000,000,000
Additional periods \| period			2
Additional period term			6 months
Accordion feature of debt	3,750,000,000		$ 3,750,000,000
Remaining borrowing capacity	2,700,000,000		2,700,000,000
Fair value of amount outstanding	49,141,000		49,141,000		$ 39,395,000
Letters of credit outstanding	24,900,000		$ 24,900,000
Unsecured debt \| Revolving Credit Facility \| LIBOR
Debt instruments
Variable interest rate			0.825%		0.875%
Unsecured Term Loan Due 2023
Debt instruments
Accordion feature of debt	800,000,000		$ 800,000,000
Unsecured debt	$ 200,000,000		200,000,000		$ 200,000,000
Unsecured Term Loan Due 2023 \| LIBOR
Debt instruments
Variable interest rate	0.90%
Unsecured Term Loan due 2025
Debt instruments
Unsecured debt	$ 394,384,000		394,384,000		392,773,000	$ 500
Unsecured Term Loan due 2025 \| Canadian Dollar Offered Rate (CDOR)
Debt instruments
Variable interest rate	0.90%
Secured revolving construction credit facility due 2022 \| Revolving Credit Facility
Debt instruments
Fair value of amount outstanding	$ 0		$ 0		$ 154,098,000
Termination of secured revolving credit facility	400,000,000
Loss on extinguishment of debt	$ 500,000