Finance Receivables - Aging Of Past Due Finance Receivables Including Non Accrual Status Finance Receivables (Details) - USD ($)	Mar. 29, 2020	Dec. 31, 2019	Mar. 31, 2019
Financing Receivable, Recorded Investment, Past Due
Financing receivable, past due	$ 184,500,000	$ 248,601,000	$ 203,141,000
Total	7,627,903,000	7,572,947,000	7,629,464,000
Current
Financing Receivable, Recorded Investment, Past Due
Financing receivable, not past due	7,443,403,000	7,324,346,000	7,426,323,000
31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivable, past due	103,463,000	143,624,000	120,012,000
61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivable, past due	39,253,000	54,379,000	43,383,000
Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivable, past due	41,784,000	50,598,000	39,746,000
Retail
Financing Receivable, Recorded Investment, Past Due
Financing receivable, past due	177,928,000	244,498,000	201,142,000
Total	6,269,247,000	6,416,428,000	6,290,036,000
Retail | Current
Financing Receivable, Recorded Investment, Past Due
Financing receivable, not past due	6,091,319,000	6,171,930,000	6,088,894,000
Retail | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivable, past due	101,412,000	142,479,000	119,150,000
Retail | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivable, past due	37,816,000	53,995,000	43,028,000
Retail | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivable, past due	38,700,000	48,024,000	38,964,000
Wholesale
Financing Receivable, Recorded Investment, Past Due
Financing receivable, past due	6,572,000	4,103,000	1,999,000
Total	1,358,656,000	1,156,519,000	1,339,428,000
Wholesale | Current
Financing Receivable, Recorded Investment, Past Due
Financing receivable, not past due	1,352,084,000	1,152,416,000	1,337,429,000
Wholesale | 31-60 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivable, past due	2,051,000	1,145,000	862,000
Wholesale | 61-90 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivable, past due	1,437,000	384,000	355,000
Wholesale | Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due
Financing receivable, past due	$ 3,084,000	$ 2,574,000	$ 782,000