Debt - Debt With A Contractual Term Greater Than One Year (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 EUR (€)	Dec. 31, 2019 EUR (€)
Debt Instrument [Line Items]
Long-term debt, net	$ 7,972,530	$ 6,872,935
Current portion of long-term debt, net	(2,039,597)	(1,748,109)
Long-term debt	5,932,933	5,124,826
Secured Debt
Debt Instrument [Line Items]
Unamortized discounts and debt issuance costs	(8,437)	(2,573)
Long-term debt, net	2,310,839	1,369,512
Secured Debt | Asset-backed Canadian commercial paper conduit facility
Debt Instrument [Line Items]
Long-term debt, gross	116,678	114,693
Secured Debt | Asset-backed U.S. commercial paper conduit facilities
Debt Instrument [Line Items]
Long-term debt, gross	402,205	490,427
Secured Debt | Asset-backed securitization debt
Debt Instrument [Line Items]
Long-term debt, gross	1,800,393	766,965
Medium-term Notes
Debt Instrument [Line Items]
Unamortized discounts and debt issuance costs	(15,374)	(12,809)
Long-term debt, net	4,917,714	4,760,127
Medium-term Notes | 2.15% Medium-term notes due 2020
Debt Instrument [Line Items]
Long-term debt, gross	0	600,000
Medium-term Notes | Floating-Rate Medium Term Notes due 2020
Debt Instrument [Line Items]
Long-term debt, gross	0	450,000
Medium-term Notes | Two Point Four Percent Medium-Term Notes Due 2020
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	$ 350,000
Stated interest rate	2.40%	2.40%	2.40%	2.40%
Medium-term Notes | Two Point Eighty-five Percent Medium-Term Notes Due 2021
Debt Instrument [Line Items]
Long-term debt, gross	$ 600,000	$ 600,000
Stated interest rate	2.85%	2.85%	2.85%	2.85%
Medium-term Notes | Floating-Rate Medium Term Notes due 2021
Debt Instrument [Line Items]
Long-term debt, gross	$ 450,000	$ 450,000
Medium-term Notes | Three Point Fifty-five Percent Medium Term Notes due 2021
Debt Instrument [Line Items]
Long-term debt, gross	$ 350,000	$ 350,000
Stated interest rate	3.55%	3.55%	3.55%	3.55%
Medium-term Notes | Four Point Zero Five Percent Medium-Term Notes Due 2022
Debt Instrument [Line Items]
Long-term debt, gross	$ 550,000	$ 550,000
Stated interest rate	4.05%	4.05%	4.05%	4.05%
Medium-term Notes | Two Point Fifty-five Percent Medium-Term Notes Due 2022
Debt Instrument [Line Items]
Long-term debt, gross	$ 400,000	$ 400,000
Stated interest rate	2.55%	2.55%	2.55%	2.55%
Medium-term Notes | Three Point Thirty-five Percent Medium Term Notes due 2023
Debt Instrument [Line Items]
Long-term debt, gross	$ 350,000	$ 350,000
Stated interest rate	3.35%	3.35%	3.35%	3.35%
Medium-term Notes | Four Point Ninety Four Percent Medium-Term Notes Due 2023
Debt Instrument [Line Items]
Long-term debt, gross	$ 797,206	$ 0	€ 650,000,000.0
Stated interest rate	4.94%	4.94%	4.94%	4.94%
Medium-term Notes | Three Point Fourteen Percent Medium Term Notes due 2024
Debt Instrument [Line Items]
Long-term debt, gross	$ 735,882	$ 672,936		€ 600,000,000.0
Stated interest rate	3.14%	3.14%	3.14%	3.14%
Medium-term Notes | Three Point Thirty Five Percent Medium Term Notes due 2025
Debt Instrument [Line Items]
Long-term debt, gross	$ 700,000	$ 0
Stated interest rate	3.35%	3.35%	3.35%	3.35%
Senior Notes
Debt Instrument [Line Items]
Unamortized discounts and debt issuance costs	$ (6,023)	$ (6,704)
Long-term debt, net	743,977	743,296
Senior Notes | 3.50% Senior unsecured notes due in 2025
Debt Instrument [Line Items]
Long-term debt, gross	$ 450,000	$ 450,000
Stated interest rate	3.50%	3.50%	3.50%	3.50%
Senior Notes | 4.625% Senior unsecured notes due in 2045
Debt Instrument [Line Items]
Long-term debt, gross	$ 300,000	$ 300,000
Stated interest rate	4.625%	4.625%	4.625%	4.625%
Senior Unsecured Debt
Debt Instrument [Line Items]
Long-term debt, net	$ 5,661,691	$ 5,503,423
Senior Unsecured Debt | Floating-Rate Medium Term Notes due 2020
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%	0.50%
Senior Unsecured Debt | Floating-Rate Medium Term Notes due 2021
Debt Instrument [Line Items]
Stated interest rate	0.94%	0.94%	0.94%	0.94%
London Interbank Offered Rate (LIBOR) | Senior Unsecured Debt | 2.15% Medium-term notes due 2020
Debt Instrument [Line Items]
Stated interest rate	2.15%	2.15%	2.15%	2.15%