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Debt - Key Term and Carrying Value (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Debt outstanding	$ 8,307,640	$ 6,444,925
Unamortized debt costs	(62,630)	(42,747)
Unamortized debt premiums & discounts	(3,738)	(599)
Unamortized fair value debt adjustment	(32)	1,691
Debt, net of unamortized debt costs	$ 8,241,240	6,403,270
Institutional notes
Debt Instrument [Line Items]
Debt instrument, interest rate, effective percentage	0.00%
Debt outstanding	$ 0	1,642,314
Asset-backed securitization term notes
Debt Instrument [Line Items]
Debt instrument, interest rate, effective percentage	1.98%
Debt outstanding	$ 3,893,421	2,920,807
Corporate notes
Debt Instrument [Line Items]
Debt instrument, interest rate, effective percentage	1.82%
Debt outstanding	$ 2,300,000	0
Term loan facilities
Debt Instrument [Line Items]
Debt instrument, interest rate, effective percentage	1.58%
Debt outstanding	$ 1,023,600	840,000
Asset-backed securitization warehouse
Debt Instrument [Line Items]
Debt instrument, interest rate, effective percentage	1.94%
Debt outstanding	$ 320,000	264,000
Revolving credit facilities
Debt Instrument [Line Items]
Debt instrument, interest rate, effective percentage	1.62%
Debt outstanding	$ 755,000	760,500
Capital lease obligations
Debt Instrument [Line Items]
Debt instrument, interest rate, effective percentage	4.93%
Debt outstanding	$ 15,619	17,304
Level 2
Debt Instrument [Line Items]
Debt outstanding	$ 8,311,100	$ 6,536,500

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Amount of short-term and long-term debt and lease obligation.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Amount, after accumulated amortization, of debt discount (premium).

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