Fair Value - Summary of Fair Value and Carrying Value of Company Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 27, 2021	Dec. 31, 2020	Jun. 28, 2020
Fair Value
ASSETS
Finance receivables, net	$ 7,141,608	$ 6,586,348	$ 7,143,575
Liabilities
Deposits, net	260,338	79,965	17,996
Fair Value \| Medium-term notes
Debt
Long-term debt, fair value	3,651,957	5,118,928	4,805,766
Fair Value \| Senior notes
Debt
Long-term debt, fair value	804,187	828,141	790,355
Fair Value \| Asset-backed U.S. commercial paper conduit facilities \| Secured Debt
Debt
Long-term debt, fair value	291,511	402,205	540,840
Fair Value \| Asset-backed Canadian commercial paper conduit facility \| Secured Debt
Debt
Long-term debt, fair value	87,439	116,678	144,661
Fair Value \| Asset-backed securitization debt \| Secured Debt
Debt
Long-term debt, fair value	1,744,841	1,817,892	2,484,956
Fair Value \| Unsecured commercial paper
Debt
Unsecured commercial paper	749,037	1,014,274	1,397,388
Fair Value \| U.S. Line of Credit
Debt
Unsecured commercial paper	0	0	150,000
Carrying Value
ASSETS
Finance receivables, net	6,888,954	6,443,008	6,979,991
Liabilities
Deposits, net	259,373	79,965	17,996
Carrying Value \| Medium-term notes
Debt
Long-term debt, fair value	3,476,057	4,917,714	4,784,293
Carrying Value \| Senior notes
Debt
Long-term debt, fair value	744,321	743,977	743,635
Carrying Value \| Asset-backed U.S. commercial paper conduit facilities \| Secured Debt
Debt
Long-term debt, fair value	291,511	402,205	540,840
Carrying Value \| Asset-backed Canadian commercial paper conduit facility \| Secured Debt
Debt
Long-term debt, fair value	87,439	116,678	144,661
Carrying Value \| Asset-backed securitization debt \| Secured Debt
Debt
Long-term debt, fair value	1,727,522	1,791,956	2,461,107
Carrying Value \| Unsecured commercial paper
Debt
Unsecured commercial paper	749,037	1,014,274	1,397,388
Carrying Value \| U.S. Line of Credit
Debt
Unsecured commercial paper	$ 0	$ 0	$ 150,000

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- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
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- Definition

Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

+ References

No definition available.

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Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.

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