v3.26.3
Amortized Cost Basis of Finance Receivables and Charge-offs by Credit Quality Indicator and Portfolio Class (Detail) - Financial Services - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Financing Receivable, Recorded Investment [Line Items]      
Financed Receivables, By Origination Year, Loans $ 4,227.1   $ 4,354.8
Financing Receivable Originated In Current Fiscal Year 4,074.8   5,829.4
Financing Receivable, Originated One Year before Current Fiscal Year 4,681.1   4,496.3
Financing Receivable, Originated Two Years before Current Fiscal Year 3,414.8   3,000.6
Financing Receivable, Originated Three Years before Current Fiscal Year 2,077.8   1,444.7
Financing Receivable, Originated Four Years before Current Fiscal Year 832.0   471.5
Financed Receivables, By Origination Year, Prior 255.5   201.2
Finance Receivables, Total 19,563.1   19,798.5
Finance Receivables Gross Charge-offs, Total 113.1 $ 66.3  
Dealer      
Financing Receivable, Recorded Investment [Line Items]      
Financed Receivables, By Origination Year, Loans 4,227.1   4,354.8
Financing Receivable Originated In Current Fiscal Year 499.3   592.0
Financing Receivable, Originated One Year before Current Fiscal Year 519.9   568.5
Financing Receivable, Originated Two Years before Current Fiscal Year 476.6   507.4
Financing Receivable, Originated Three Years before Current Fiscal Year 406.0   307.1
Financing Receivable, Originated Four Years before Current Fiscal Year 236.7   135.0
Financed Receivables, By Origination Year, Prior 126.3   119.6
Finance Receivables, Total 6,491.9   6,584.4
Dealer | Wholesale      
Financing Receivable, Recorded Investment [Line Items]      
Financed Receivables, By Origination Year, Loans 4,000.9   4,126.3
Finance Receivables, Total 4,000.9   4,126.3
Dealer | Wholesale | Performing      
Financing Receivable, Recorded Investment [Line Items]      
Financed Receivables, By Origination Year, Loans 3,937.3   4,114.6
Finance Receivables, Total 3,937.3   4,114.6
Dealer | Wholesale | Watch      
Financing Receivable, Recorded Investment [Line Items]      
Financed Receivables, By Origination Year, Loans 61.0   8.1
Finance Receivables, Total 61.0   8.1
Dealer | Wholesale | At-risk      
Financing Receivable, Recorded Investment [Line Items]      
Financed Receivables, By Origination Year, Loans 2.6   3.6
Finance Receivables, Total 2.6   3.6
Dealer | Retail      
Financing Receivable, Recorded Investment [Line Items]      
Financed Receivables, By Origination Year, Loans 226.2   228.5
Financing Receivable Originated In Current Fiscal Year 499.3   592.0
Financing Receivable, Originated One Year before Current Fiscal Year 519.9   568.5
Financing Receivable, Originated Two Years before Current Fiscal Year 476.6   507.4
Financing Receivable, Originated Three Years before Current Fiscal Year 406.0   307.1
Financing Receivable, Originated Four Years before Current Fiscal Year 236.7   135.0
Financed Receivables, By Origination Year, Prior 126.3   119.6
Finance Receivables, Total 2,491.0   2,458.1
Dealer | Retail | Performing      
Financing Receivable, Recorded Investment [Line Items]      
Financed Receivables, By Origination Year, Loans 226.2   228.5
Financing Receivable Originated In Current Fiscal Year 499.3   590.5
Financing Receivable, Originated One Year before Current Fiscal Year 518.6   567.7
Financing Receivable, Originated Two Years before Current Fiscal Year 476.1   506.1
Financing Receivable, Originated Three Years before Current Fiscal Year 405.1   306.7
Financing Receivable, Originated Four Years before Current Fiscal Year 236.3   134.7
Financed Receivables, By Origination Year, Prior 126.2   119.6
Finance Receivables, Total 2,487.8   2,453.8
Dealer | Retail | Watch      
Financing Receivable, Recorded Investment [Line Items]      
Financing Receivable Originated In Current Fiscal Year     1.5
Financing Receivable, Originated One Year before Current Fiscal Year 1.3   0.8
Financing Receivable, Originated Two Years before Current Fiscal Year 0.5   1.3
Financing Receivable, Originated Three Years before Current Fiscal Year 0.9   0.4
Financing Receivable, Originated Four Years before Current Fiscal Year 0.4   0.3
Financed Receivables, By Origination Year, Prior 0.1    
Finance Receivables, Total 3.2   4.3
Customer Retail      
Financing Receivable, Recorded Investment [Line Items]      
Financing Receivable Originated In Current Fiscal Year 3,575.5   5,237.4
Financing Receivable, Originated One Year before Current Fiscal Year 4,161.2   3,927.8
Financing Receivable, Originated Two Years before Current Fiscal Year 2,938.2   2,493.2
Financing Receivable, Originated Three Years before Current Fiscal Year 1,671.8   1,137.6
Financing Receivable, Originated Four Years before Current Fiscal Year 595.3   336.5
Financed Receivables, By Origination Year, Prior 129.2   81.6
Finance Receivables, Total 13,071.2   13,214.1
Financing Receivables Gross Charge-offs, Year One, Originated, Current Fiscal Year 1.6   1.6
Financing Receivables Gross Charge-offs, Originated One Year before Current Fiscal Year 18.1   12.7
Financing Receivables Gross Charge-offs, Originated Two Years before Current Fiscal Year 23.3   40.2
Financing Receivables Gross Charge-offs, Originated Three Years before Current Fiscal Year 33.1   22.6
Financing Receivables Gross Charge-offs, Originated Four Years before Current Fiscal Year 19.0   9.6
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff 16.8   7.1
Finance Receivables Gross Charge-offs, Total 111.9 $ 65.7 93.8
Customer Retail | Fleet      
Financing Receivable, Recorded Investment [Line Items]      
Financing Receivable Originated In Current Fiscal Year 3,096.3   4,599.4
Financing Receivable, Originated One Year before Current Fiscal Year 3,653.4   3,514.5
Financing Receivable, Originated Two Years before Current Fiscal Year 2,630.4   2,271.5
Financing Receivable, Originated Three Years before Current Fiscal Year 1,523.2   1,014.6
Financing Receivable, Originated Four Years before Current Fiscal Year 531.4   279.6
Financed Receivables, By Origination Year, Prior 111.7   70.9
Finance Receivables, Total 11,546.4   11,750.5
Financing Receivables Gross Charge-offs, Year One, Originated, Current Fiscal Year 0.8   1.3
Financing Receivables Gross Charge-offs, Originated One Year before Current Fiscal Year 15.9   10.6
Financing Receivables Gross Charge-offs, Originated Two Years before Current Fiscal Year 21.8   37.6
Financing Receivables Gross Charge-offs, Originated Three Years before Current Fiscal Year 31.3   19.7
Financing Receivables Gross Charge-offs, Originated Four Years before Current Fiscal Year 17.2   9.0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff 16.5   6.8
Finance Receivables Gross Charge-offs, Total 103.5   85.0
Customer Retail | Fleet | Performing      
Financing Receivable, Recorded Investment [Line Items]      
Financing Receivable Originated In Current Fiscal Year 2,952.2   4,465.0
Financing Receivable, Originated One Year before Current Fiscal Year 3,451.1   3,399.5
Financing Receivable, Originated Two Years before Current Fiscal Year 2,509.6   2,060.2
Financing Receivable, Originated Three Years before Current Fiscal Year 1,356.8   919.3
Financing Receivable, Originated Four Years before Current Fiscal Year 475.9   254.4
Financed Receivables, By Origination Year, Prior 96.2   68.6
Finance Receivables, Total 10,841.8   11,167.0
Customer Retail | Fleet | Watch      
Financing Receivable, Recorded Investment [Line Items]      
Financing Receivable Originated In Current Fiscal Year 20.3   63.7
Financing Receivable, Originated One Year before Current Fiscal Year 71.3   35.0
Financing Receivable, Originated Two Years before Current Fiscal Year 28.4   63.4
Financing Receivable, Originated Three Years before Current Fiscal Year 34.5   44.8
Financing Receivable, Originated Four Years before Current Fiscal Year 26.6   16.2
Financed Receivables, By Origination Year, Prior 10.8   0.6
Finance Receivables, Total 191.9   223.7
Customer Retail | Fleet | At-risk      
Financing Receivable, Recorded Investment [Line Items]      
Financing Receivable Originated In Current Fiscal Year 123.8   70.7
Financing Receivable, Originated One Year before Current Fiscal Year 131.0   80.0
Financing Receivable, Originated Two Years before Current Fiscal Year 92.4   147.9
Financing Receivable, Originated Three Years before Current Fiscal Year 131.9   50.5
Financing Receivable, Originated Four Years before Current Fiscal Year 28.9   9.0
Financed Receivables, By Origination Year, Prior 4.7   1.7
Finance Receivables, Total 512.7   359.8
Customer Retail | Owner/Operator      
Financing Receivable, Recorded Investment [Line Items]      
Financing Receivable Originated In Current Fiscal Year 479.2   638.0
Financing Receivable, Originated One Year before Current Fiscal Year 507.8   413.3
Financing Receivable, Originated Two Years before Current Fiscal Year 307.8   221.7
Financing Receivable, Originated Three Years before Current Fiscal Year 148.6   123.0
Financing Receivable, Originated Four Years before Current Fiscal Year 63.9   56.9
Financed Receivables, By Origination Year, Prior 17.5   10.7
Finance Receivables, Total 1,524.8   1,463.6
Financing Receivables Gross Charge-offs, Year One, Originated, Current Fiscal Year 0.8   0.3
Financing Receivables Gross Charge-offs, Originated One Year before Current Fiscal Year 2.2   2.1
Financing Receivables Gross Charge-offs, Originated Two Years before Current Fiscal Year 1.5   2.6
Financing Receivables Gross Charge-offs, Originated Three Years before Current Fiscal Year 1.8   2.9
Financing Receivables Gross Charge-offs, Originated Four Years before Current Fiscal Year 1.8   0.6
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff 0.3   0.3
Finance Receivables Gross Charge-offs, Total 8.4   8.8
Customer Retail | Owner/Operator | Performing      
Financing Receivable, Recorded Investment [Line Items]      
Financing Receivable Originated In Current Fiscal Year 476.0   624.5
Financing Receivable, Originated One Year before Current Fiscal Year 498.8   404.0
Financing Receivable, Originated Two Years before Current Fiscal Year 301.4   213.5
Financing Receivable, Originated Three Years before Current Fiscal Year 144.2   114.9
Financing Receivable, Originated Four Years before Current Fiscal Year 61.1   54.2
Financed Receivables, By Origination Year, Prior 16.5   10.1
Finance Receivables, Total 1,498.0   1,421.2
Customer Retail | Owner/Operator | Watch      
Financing Receivable, Recorded Investment [Line Items]      
Financing Receivable Originated In Current Fiscal Year 2.0   5.4
Financing Receivable, Originated One Year before Current Fiscal Year 3.9   5.5
Financing Receivable, Originated Two Years before Current Fiscal Year 3.1   4.2
Financing Receivable, Originated Three Years before Current Fiscal Year 2.6   3.6
Financing Receivable, Originated Four Years before Current Fiscal Year 0.9   1.6
Financed Receivables, By Origination Year, Prior 0.2   0.3
Finance Receivables, Total 12.7   20.6
Customer Retail | Owner/Operator | At-risk      
Financing Receivable, Recorded Investment [Line Items]      
Financing Receivable Originated In Current Fiscal Year 1.2   8.1
Financing Receivable, Originated One Year before Current Fiscal Year 5.1   3.8
Financing Receivable, Originated Two Years before Current Fiscal Year 3.3   4.0
Financing Receivable, Originated Three Years before Current Fiscal Year 1.8   4.5
Financing Receivable, Originated Four Years before Current Fiscal Year 1.9   1.1
Financed Receivables, By Origination Year, Prior 0.8   0.3
Finance Receivables, Total $ 14.1   $ 21.8