Senior Notes Payable and Other Debt - Credit Facilities and Unsecured Term Loans (Details) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2021 USD ($) period	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2021 CAD ($)
Debt Instrument [Line Items]
Commercial paper program capacity		$ 1,000,000,000
Commercial Paper		280,000,000	$ 0
Loss on extinguishment of debt, net		(59,299,000)	(10,791,000)	$ (41,900,000)
Long-term debt, gross		12,093,138,000	11,983,071,000
Unsecured Term Loan Due 2023
Debt Instrument [Line Items]
Accordion feature of debt		800,000,000
Unsecured Debt		$ 200,000,000	200,000,000
Unsecured Term Loan Due 2023 | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		0.90%
Unsecured Term Loan due 2025 [Member]
Debt Instrument [Line Items]
Unsecured Debt		$ 395,757,000	392,773,000		$ 500
Unsecured Term Loan due 2025 [Member] | Canadian Dollar Offered Rate (CDOR) [Member]
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate		0.90%
Revolving Credit Facility
Debt Instrument [Line Items]
Letters of credit outstanding		$ 24,900,000
Revolving Credit Facility | Unsecured Debt
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 2,750,000,000		3,000,000,000
Additional periods | period	2
Additional period term	6 months
Line of credit facility, amount outstanding		56,448,000	$ 39,395,000
Accordion Feature Of Debt	$ 3,750,000,000
Line of credit facility, remaining borrowing capacity		2,700,000,000
Long-term debt, gross		56,400,000
Revolving Credit Facility | Unsecured Debt | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	0.825%		0.875%
Revolving Credit Facility | Secured Debt [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		400,000,000
Loss on extinguishment of debt, net		$ (500,000)