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Senior Notes Payable and Other Debt - Credit Facilities and Unsecured Term Loans (Details) $ in Millions		6 Months Ended	12 Months Ended
	Jan. 01, 2021 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2020 USD ($) period	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2020 CAD ($)
Debt Instrument [Line Items]
Commercial paper program capacity			$ 1,000,000,000.0
Commercial Paper			0	$ 567,450,000
Loss on extinguishment of debt, net			(10,791,000)	(41,900,000)	$ (58,254,000)
Unsecured Term Loan Due 2023
Debt Instrument [Line Items]
Accordion feature of debt			800,000,000.0
Unsecured Debt		$ 300,000,000.0	$ 200,000,000.0
Repayments of debt		100,000,000.0
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 2024
Debt Instrument [Line Items]
Repayments of debt		600,000,000.0
Unsecured Term Loan due 2025 [Member]
Debt Instrument [Line Items]
Unsecured Debt			$ 392,773,000	$ 385,030,000		$ 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%
Unsecured Term Loans Due 2023 and 2024 [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt, net		$ 3,200,000
Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, amount outstanding			$ 39,400,000
Letters of credit outstanding			$ 24,900,000
Revolving Credit Facility \| Unsecured Debt
Debt Instrument [Line Items]
Additional periods \| period			2
Additional period term			6 months
Accordion feature of debt			$ 3,750,000,000
Line of credit, remaining availability less commercial paper			2,900,000,000
Revolving Credit Facility \| Unsecured Debt \| COVID-19 Impact
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 2,750,000,000		$ 3,000,000,000.0
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			$ 400,000,000.0
Line of credit facility, amount outstanding			$ 154,100,000