Finance Receivables - Schedule of Recorded Investment of Retail and Wholesale Finance Receivables by Credit Quality Indicator (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Financing Receivable, Recorded Investment
Total	$ 1,870,648	$ 8,200,299	$ 1,870,648	$ 8,200,299	$ 7,689,477
Gross charge-offs
Total	49,256	65,029	188,737	207,109
Wholesale
Financing Receivable, Recorded Investment
Year 1	991,716	1,040,711	991,716	1,040,711	860,131
Year 2	122,641	145,019	122,641	145,019	95,743
Year 3	15,380	38,362	15,380	38,362	39,102
Year 4	34,370	2,567	34,370	2,567	1,702
Year 5	1,235	3,500	1,235	3,500	3,358
More than 5 years	1,012	8,165	1,012	8,165	8,335
Total	1,166,354	1,238,324	1,166,354	1,238,324	1,008,371
Gross charge-offs
Year 1			2,401	0	709
Year 2			506	0	710
Year 3			134	0	42
Year 4			0	0	0
Year 5			0	0	0
More than 5 years			2,301	0	1
Total	4,701	0	5,342	0	1,462
Wholesale | Non-Performing
Financing Receivable, Recorded Investment
Year 1	933	1,986	933	1,986	6,430
Year 2	1,090	2,134	1,090	2,134	4,702
Year 3	282	122	282	122	129
Year 4	0	0	0	0	0
Year 5	0	0	0	0	0
More than 5 years	0	2	0	2	2
Total	2,305	4,244	2,305	4,244	11,263
Wholesale | Doubtful
Financing Receivable, Recorded Investment
Year 1	15,333	9,939	15,333	9,939	25,827
Year 2	7,473	4,043	7,473	4,043	3,869
Year 3	1,070	129	1,070	129	139
Year 4	20	0	20	0	0
Year 5	0	0	0	0	0
More than 5 years	0	5	0	5	8,196
Total	23,896	14,116	23,896	14,116	38,031
Wholesale | Substandard
Financing Receivable, Recorded Investment
Year 1	1,831	14,669	1,831	14,669	14,470
Year 2	1,796	3,391	1,796	3,391	2,928
Year 3	0	34	0	34	0
Year 4	0	0	0	0	0
Year 5	0	0	0	0	0
More than 5 years	0	0	0	0	0
Total	3,627	18,094	3,627	18,094	17,398
Wholesale | Special Mention
Financing Receivable, Recorded Investment
Year 1	16,109	4,527	16,109	4,527	3,162
Year 2	4,171	1,240	4,171	1,240	362
Year 3	175	58	175	58	19
Year 4	0	0	0	0	0
Year 5	59	0	59	0	0
More than 5 years	0	0	0	0	0
Total	20,514	5,825	20,514	5,825	3,543
Wholesale | Medium Risk
Financing Receivable, Recorded Investment
Year 1	36,215	615	36,215	615	1,471
Year 2	4,268	146	4,268	146	271
Year 3	752	0	752	0	0
Year 4	0	0	0	0	0
Year 5	0	0	0	0	0
More than 5 years	0	0	0	0	0
Total	41,235	761	41,235	761	1,742
Wholesale | Low Risk
Financing Receivable, Recorded Investment
Year 1	921,295	1,008,975	921,295	1,008,975	808,771
Year 2	103,843	134,065	103,843	134,065	83,611
Year 3	13,101	38,019	13,101	38,019	38,815
Year 4	34,350	2,567	34,350	2,567	1,702
Year 5	1,176	3,500	1,176	3,500	3,358
More than 5 years	1,012	8,158	1,012	8,158	137
Total	$ 1,074,777	$ 1,195,284	$ 1,074,777	$ 1,195,284	$ 936,394