Finance Receivables - Schedule of Financing Receivable Credit Quality Indicators (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Financing Receivable, Allowance for Credit Losses
Total	$ 7,725,515	$ 8,412,081	$ 7,725,515	$ 8,412,081	$ 7,689,477
Gross charge-offs
Total	61,306	60,712	139,481	142,080
Retail
Financing Receivable, Allowance for Credit Losses
Year 1	1,359,879	1,608,508	1,359,879	1,608,508	2,448,913
Year 2	2,001,976	2,173,909	2,001,976	2,173,909	1,780,330
Year 3	1,429,240	1,642,787	1,429,240	1,642,787	1,313,909
Year 4	1,018,507	914,569	1,018,507	914,569	702,736
Year 5	513,578	385,315	513,578	385,315	273,313
More than 5 years	269,863	268,842	269,863	268,842	161,905
Total	6,593,043	6,993,930	6,593,043	6,993,930	6,681,106
Gross charge-offs
Year 1			552	615	18,563
Year 2			36,292	43,583	93,963
Year 3			41,955	49,653	91,421
Year 4			32,678	26,772	48,433
Year 5			16,906	11,275	20,019
More than 5 years			10,457	10,182	17,607
Total	61,306	60,712	138,840	142,080	290,006
Retail | UNITED STATES
Financing Receivable, Allowance for Credit Losses
Year 1	1,333,455	1,574,764	1,333,455	1,574,764	2,402,090
Year 2	1,962,847	2,123,103	1,962,847	2,123,103	1,741,316
Year 3	1,397,256	1,608,852	1,397,256	1,608,852	1,288,745
Year 4	998,884	896,027	998,884	896,027	689,938
Year 5	504,490	375,696	504,490	375,696	267,460
More than 5 years	264,923	263,099	264,923	263,099	159,001
Total	6,461,855	6,841,541	6,461,855	6,841,541	6,548,550
Gross charge-offs
Year 1			552	615	18,322
Year 2			35,544	42,843	92,489
Year 3			41,325	48,949	90,023
Year 4			32,086	26,374	47,678
Year 5			16,614	11,088	19,628
More than 5 years			10,125	9,932	17,143
Total			136,246	139,801	285,283
Retail | CANADA
Financing Receivable, Allowance for Credit Losses
Year 1	26,424	33,744	26,424	33,744	46,823
Year 2	39,129	50,806	39,129	50,806	39,014
Year 3	31,984	33,935	31,984	33,935	25,164
Year 4	19,623	18,542	19,623	18,542	12,798
Year 5	9,088	9,619	9,088	9,619	5,853
More than 5 years	4,940	5,743	4,940	5,743	2,904
Total	131,188	152,389	131,188	152,389	132,556
Gross charge-offs
Year 1			0	0	241
Year 2			748	740	1,474
Year 3			630	704	1,398
Year 4			592	398	755
Year 5			292	187	391
More than 5 years			332	250	464
Total			2,594	2,279	4,723
Retail | Super prime | UNITED STATES
Financing Receivable, Allowance for Credit Losses
Year 1	549,485	684,675	549,485	684,675	1,040,491
Year 2	828,526	858,653	828,526	858,653	694,941
Year 3	545,156	575,749	545,156	575,749	449,697
Year 4	335,566	282,472	335,566	282,472	206,974
Year 5	142,404	103,657	142,404	103,657	67,668
More than 5 years	52,812	53,898	52,812	53,898	28,606
Total	2,453,949	2,559,104	2,453,949	2,559,104	2,488,377
Retail | Super prime | CANADA
Financing Receivable, Allowance for Credit Losses
Year 1	19,449	25,927	19,449	25,927	36,011
Year 2	29,869	38,107	29,869	38,107	29,098
Year 3	23,599	23,842	23,599	23,842	17,468
Year 4	13,497	12,492	13,497	12,492	8,330
Year 5	5,522	5,744	5,522	5,744	3,179
More than 5 years	2,131	2,558	2,131	2,558	1,096
Total	94,067	108,670	94,067	108,670	95,182
Retail | Prime | UNITED STATES
Financing Receivable, Allowance for Credit Losses
Year 1	571,939	682,513	571,939	682,513	1,042,910
Year 2	870,644	988,918	870,644	988,918	821,719
Year 3	671,113	810,245	671,113	810,245	659,000
Year 4	521,027	462,594	521,027	462,594	363,507
Year 5	271,193	194,018	271,193	194,018	141,495
More than 5 years	141,509	136,465	141,509	136,465	82,771
Total	3,047,425	3,274,753	3,047,425	3,274,753	3,111,402
Retail | Prime | CANADA
Financing Receivable, Allowance for Credit Losses
Year 1	5,956	6,535	5,956	6,535	9,111
Year 2	7,736	11,106	7,736	11,106	8,687
Year 3	7,359	8,880	7,359	8,880	6,724
Year 4	5,444	5,513	5,444	5,513	4,033
Year 5	3,261	3,232	3,261	3,232	2,212
More than 5 years	2,305	2,680	2,305	2,680	1,524
Total	32,061	37,946	32,061	37,946	32,291
Retail | Sub-prime | UNITED STATES
Financing Receivable, Allowance for Credit Losses
Year 1	212,031	207,576	212,031	207,576	318,689
Year 2	263,677	275,532	263,677	275,532	224,656
Year 3	180,987	222,858	180,987	222,858	180,048
Year 4	142,291	150,961	142,291	150,961	119,457
Year 5	90,893	78,021	90,893	78,021	58,297
More than 5 years	70,602	72,736	70,602	72,736	47,624
Total	960,481	1,007,684	960,481	1,007,684	948,771
Retail | Sub-prime | CANADA
Financing Receivable, Allowance for Credit Losses
Year 1	1,019	1,282	1,019	1,282	1,701
Year 2	1,524	1,593	1,524	1,593	1,229
Year 3	1,026	1,213	1,026	1,213	972
Year 4	682	537	682	537	435
Year 5	305	643	305	643	462
More than 5 years	504	505	504	505	284
Total	$ 5,060	$ 5,773	$ 5,060	$ 5,773	$ 5,083