Finance Receivables - Recorded Investment in Retail Finance Receivables, by Credit Quality Indicator (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Recorded Investment
Total	$ 7,880,231	$ 7,497,149
Current YTD period gross charge-offs:
Total	263,915	176,718	$ 122,637
United States
Financing Receivable, Recorded Investment
Total	7,674,813
Canada
Financing Receivable, Recorded Investment
Total	205,418
Retail
Financing Receivable, Recorded Investment
Year 1	2,637,198	3,039,349
Year 2	2,043,433	1,841,057
Year 3	1,176,286	892,848
Year 4	526,884	546,562
Year 5	280,805	271,617
After year 5	154,093	156,768
Total	6,818,699	6,748,201
Current YTD period gross charge-offs:
Year 1	20,574
Year 2	103,391
Year 3	75,078
Year 4	31,368
Year 5	18,366
After year 5	15,138
Total	263,915	176,718	$ 122,637
Retail | United States
Financing Receivable, Recorded Investment
Year 1	2,572,883	2,971,999
Year 2	1,998,720	1,798,860
Year 3	1,150,467	866,839
Year 4	512,436	528,380
Year 5	273,031	263,099
After year 5	150,461	153,139
Total	6,657,998	6,582,316
Current YTD period gross charge-offs:
Year 1	20,047
Year 2	102,387
Year 3	74,212
Year 4	30,896
Year 5	18,088
After year 5	14,655
Total	260,285
Retail | Canada
Financing Receivable, Recorded Investment
Year 1	64,315	67,350
Year 2	44,713	42,197
Year 3	25,819	26,009
Year 4	14,448	18,182
Year 5	7,774	8,518
After year 5	3,632	3,629
Total	160,701	165,885
Current YTD period gross charge-offs:
Year 1	527
Year 2	1,004
Year 3	866
Year 4	472
Year 5	278
After year 5	483
Total	3,630
Retail | Super prime | United States
Financing Receivable, Recorded Investment
Year 1	1,066,321	1,118,198
Year 2	729,339	612,890
Year 3	376,474	276,492
Year 4	151,004	159,550
Year 5	70,627	69,652
After year 5	27,013	26,701
Total	2,420,778	2,263,483
Retail | Super prime | Canada
Financing Receivable, Recorded Investment
Year 1	48,705	49,033
Year 2	31,733	30,090
Year 3	17,744	17,553
Year 4	9,241	12,215
Year 5	4,521	4,975
After year 5	1,524	1,527
Total	113,468	115,393
Retail | Prime | United States
Financing Receivable, Recorded Investment
Year 1	1,173,463	1,433,141
Year 2	993,417	887,817
Year 3	584,305	425,401
Year 4	259,995	260,458
Year 5	139,011	135,454
After year 5	78,880	79,611
Total	3,229,071	3,221,882
Retail | Prime | Canada
Financing Receivable, Recorded Investment
Year 1	13,764	16,094
Year 2	11,434	10,705
Year 3	7,336	7,283
Year 4	4,390	5,098
Year 5	2,728	3,068
After year 5	1,838	1,787
Total	41,490	44,035
Retail | Sub-prime | United States
Financing Receivable, Recorded Investment
Year 1	333,099	420,660
Year 2	275,964	298,153
Year 3	189,688	164,946
Year 4	101,437	108,372
Year 5	63,393	57,993
After year 5	44,568	46,827
Total	1,008,149	1,096,951
Retail | Sub-prime | Canada
Financing Receivable, Recorded Investment
Year 1	1,846	2,223
Year 2	1,546	1,402
Year 3	739	1,173
Year 4	817	869
Year 5	525	475
After year 5	270	315
Total	$ 5,743	$ 6,457