Finance Receivables - Schedule of Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Financing Receivable, Allowance for Credit Losses
Total	$ 7,792,785	$ 8,286,383	$ 7,689,477
Gross charge-offs
Total	78,175	81,368
Retail
Financing Receivable, Allowance for Credit Losses
Year 1	576,925	708,187	2,448,913
Year 2	2,223,321	2,414,038	1,780,330
Year 3	1,602,031	1,837,677	1,313,909
Year 4	1,161,261	1,041,701	702,736
Year 5	606,188	453,933	273,313
More than 5 years	345,007	343,974	161,905
Total	6,514,733	6,799,510	6,681,106
Gross charge-offs
Year 1	0	0	18,563
Year 2	18,742	22,005	93,963
Year 3	23,207	29,083	91,421
Year 4	19,032	16,498	48,433
Year 5	9,934	7,256	20,019
More than 5 years	6,619	6,526	17,607
Total	77,534	81,368	290,006
Retail | UNITED STATES
Financing Receivable, Allowance for Credit Losses
Year 1	566,325	693,429	2,402,090
Year 2	2,181,007	2,356,399	1,741,316
Year 3	1,567,327	1,798,357	1,288,745
Year 4	1,139,153	1,019,696	689,938
Year 5	595,412	441,954	267,460
More than 5 years	338,440	335,771	159,001
Total	6,387,664	6,645,606	6,548,550
Gross charge-offs
Year 1	0	0	18,322
Year 2	18,323	21,760	92,489
Year 3	22,716	28,748	90,023
Year 4	18,667	16,286	47,678
Year 5	9,775	7,111	19,628
More than 5 years	6,425	6,363	17,143
Total	75,906	80,268	285,283
Retail | CANADA
Financing Receivable, Allowance for Credit Losses
Year 1	10,600	14,758	46,823
Year 2	42,314	57,639	39,014
Year 3	34,704	39,320	25,164
Year 4	22,108	22,005	12,798
Year 5	10,776	11,979	5,853
More than 5 years	6,567	8,203	2,904
Total	127,069	153,904	132,556
Gross charge-offs
Year 1	0	0	241
Year 2	419	245	1,474
Year 3	491	335	1,398
Year 4	365	212	755
Year 5	159	145	391
More than 5 years	194	163	464
Total	1,628	1,100	4,723
Retail | Super prime | UNITED STATES
Financing Receivable, Allowance for Credit Losses
Year 1	246,251	311,848	1,040,491
Year 2	930,951	963,226	694,941
Year 3	619,801	651,375	449,697
Year 4	390,933	328,904	206,974
Year 5	173,826	126,727	67,668
More than 5 years	72,153	73,138	28,606
Total	2,433,915	2,455,218	2,488,377
Retail | Super prime | CANADA
Financing Receivable, Allowance for Credit Losses
Year 1	8,019	11,736	36,011
Year 2	32,371	43,504	29,098
Year 3	25,930	27,785	17,468
Year 4	15,301	15,068	8,330
Year 5	6,824	7,456	3,179
More than 5 years	3,038	4,063	1,096
Total	91,483	109,612	95,182
Retail | Prime | UNITED STATES
Financing Receivable, Allowance for Credit Losses
Year 1	237,047	294,135	1,042,910
Year 2	959,136	1,087,821	821,719
Year 3	746,249	900,078	659,000
Year 4	588,551	522,250	363,507
Year 5	316,903	226,247	141,495
More than 5 years	179,922	173,807	82,771
Total	3,027,808	3,204,338	3,111,402
Retail | Prime | CANADA
Financing Receivable, Allowance for Credit Losses
Year 1	2,247	2,566	9,111
Year 2	8,365	12,375	8,687
Year 3	7,693	10,180	6,724
Year 4	6,000	6,336	4,033
Year 5	3,582	3,779	2,212
More than 5 years	2,917	3,526	1,524
Total	30,804	38,762	32,291
Retail | Sub-prime | UNITED STATES
Financing Receivable, Allowance for Credit Losses
Year 1	83,027	87,446	318,689
Year 2	290,920	305,352	224,656
Year 3	201,277	246,904	180,048
Year 4	159,669	168,542	119,457
Year 5	104,683	88,980	58,297
More than 5 years	86,365	88,826	47,624
Total	925,941	986,050	948,771
Retail | Sub-prime | CANADA
Financing Receivable, Allowance for Credit Losses
Year 1	334	456	1,701
Year 2	1,578	1,760	1,229
Year 3	1,081	1,355	972
Year 4	807	601	435
Year 5	370	744	462
More than 5 years	612	614	284
Total	$ 4,782	$ 5,530	$ 5,083