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Amortized Cost Basis of Finance Receivables and Charge-offs by Credit Quality Indicator and Portfolio Class (Detail) - Financial Services - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Financing Receivable, Recorded Investment [Line Items] |  |
Financed Receivables, By Origination Year, Loans | $ 4,770.3 | $ 5,173.9
Financing Receivable Originated In Current Fiscal Year | 4,393.1 | 5,577.5
Financing Receivable, Originated One Year before Current Fiscal Year | 4,928.7 | 4,188.0
Financing Receivable, Originated Two Years before Current Fiscal Year | 3,320.7 | 2,482.9
Financing Receivable, Originated Three Years before Current Fiscal Year | 1,714.1 | 1,173.4
Financing Receivable, Originated Four Years before Current Fiscal Year | 606.3 | 468.8
Financed Receivables, By Origination Year, Prior | 292.2 | 228.6
Finance Receivables, Total | 20,025.4 | 19,293.1
Charge Offs Of Finance Receivables |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year | 1.2 | 1.0
Financing Receivable, Originated One Year before Current Fiscal Year | 6.9 | 21.8
Financing Receivable, Originated Two Years before Current Fiscal Year | 28.0 | 15.8
Financing Receivable, Originated Three Years before Current Fiscal Year | 19.2 | 8.5
Financing Receivable, Originated Four Years before Current Fiscal Year | 6.9 | 5.5
Financed Receivables, By Origination Year, Prior | 3.5 | 8.6
Finance Receivables, Total | 65.7 | 61.2
Dealer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financed Receivables, By Origination Year, Loans | 4,770.3 | 5,173.9
Financing Receivable Originated In Current Fiscal Year | 446.8 | 682.8
Financing Receivable, Originated One Year before Current Fiscal Year | 600.0 | 664.6
Financing Receivable, Originated Two Years before Current Fiscal Year | 540.9 | 410.7
Financing Receivable, Originated Three Years before Current Fiscal Year | 330.6 | 194.9
Financing Receivable, Originated Four Years before Current Fiscal Year | 141.4 | 102.6
Financed Receivables, By Origination Year, Prior | 144.5 | 142.0
Finance Receivables, Total | 6,974.5 | 7,371.5
Dealer | Wholesale |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financed Receivables, By Origination Year, Loans | 4,539.8 | 4,944.1
Finance Receivables, Total | 4,539.8 | 4,944.1
Dealer | Wholesale | Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financed Receivables, By Origination Year, Loans | 4,532.8 | 4,936.1
Finance Receivables, Total | 4,532.8 | 4,936.1
Dealer | Wholesale | Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financed Receivables, By Origination Year, Loans | 7.0 | 7.1
Finance Receivables, Total | 7.0 | 7.1
Dealer | Wholesale | At-risk |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financed Receivables, By Origination Year, Loans |  | 0.9
Finance Receivables, Total |  | 0.9
Dealer | Retail |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financed Receivables, By Origination Year, Loans | 230.5 | 229.8
Financing Receivable Originated In Current Fiscal Year | 446.8 | 682.8
Financing Receivable, Originated One Year before Current Fiscal Year | 600.0 | 664.6
Financing Receivable, Originated Two Years before Current Fiscal Year | 540.9 | 410.7
Financing Receivable, Originated Three Years before Current Fiscal Year | 330.6 | 194.9
Financing Receivable, Originated Four Years before Current Fiscal Year | 141.4 | 102.6
Financed Receivables, By Origination Year, Prior | 144.5 | 142.0
Finance Receivables, Total | 2,434.7 | 2,427.4
Dealer | Retail | Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financed Receivables, By Origination Year, Loans | 230.5 | 229.8
Financing Receivable Originated In Current Fiscal Year | 440.4 | 680.8
Financing Receivable, Originated One Year before Current Fiscal Year | 598.2 | 641.5
Financing Receivable, Originated Two Years before Current Fiscal Year | 528.2 | 404.6
Financing Receivable, Originated Three Years before Current Fiscal Year | 326.2 | 192.8
Financing Receivable, Originated Four Years before Current Fiscal Year | 140.2 | 98.0
Financed Receivables, By Origination Year, Prior | 142.6 | 141.6
Finance Receivables, Total | 2,406.3 | 2,389.1
Dealer | Retail | Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year | 6.4 | 2.0
Financing Receivable, Originated One Year before Current Fiscal Year | 1.8 | 23.1
Financing Receivable, Originated Two Years before Current Fiscal Year | 12.7 | 6.1
Financing Receivable, Originated Three Years before Current Fiscal Year | 4.4 | 2.1
Financing Receivable, Originated Four Years before Current Fiscal Year | 1.2 | 4.6
Financed Receivables, By Origination Year, Prior | 1.9 | 0.4
Finance Receivables, Total | 28.4 | 38.3
Customer Retail |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year | 3,946.3 | 4,894.7
Financing Receivable, Originated One Year before Current Fiscal Year | 4,328.7 | 3,523.4
Financing Receivable, Originated Two Years before Current Fiscal Year | 2,779.8 | 2,072.2
Financing Receivable, Originated Three Years before Current Fiscal Year | 1,383.5 | 978.5
Financing Receivable, Originated Four Years before Current Fiscal Year | 464.9 | 366.2
Financed Receivables, By Origination Year, Prior | 147.7 | 86.6
Finance Receivables, Total | 13,050.9 | 11,921.6
Customer Retail | Fleet |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year | 3,447.5 | 4,367.2
Financing Receivable, Originated One Year before Current Fiscal Year | 3,882.4 | 3,205.8
Financing Receivable, Originated Two Years before Current Fiscal Year | 2,536.6 | 1,855.8
Financing Receivable, Originated Three Years before Current Fiscal Year | 1,236.3 | 829.6
Financing Receivable, Originated Four Years before Current Fiscal Year | 389.7 | 306.3
Financed Receivables, By Origination Year, Prior | 128.0 | 73.4
Finance Receivables, Total | 11,620.5 | 10,638.1
Customer Retail | Fleet | Charge Offs Of Finance Receivables |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year | 1.0 | 0.9
Financing Receivable, Originated One Year before Current Fiscal Year | 5.5 | 19.4
Financing Receivable, Originated Two Years before Current Fiscal Year | 26.5 | 12.1
Financing Receivable, Originated Three Years before Current Fiscal Year | 16.9 | 7.5
Financing Receivable, Originated Four Years before Current Fiscal Year | 6.4 | 4.2
Financed Receivables, By Origination Year, Prior | 3.2 | 7.8
Finance Receivables, Total | 59.5 | 51.9
Customer Retail | Fleet | Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year | 3,343.1 | 4,306.5
Financing Receivable, Originated One Year before Current Fiscal Year | 3,767.3 | 2,991.4
Financing Receivable, Originated Two Years before Current Fiscal Year | 2,331.1 | 1,761.1
Financing Receivable, Originated Three Years before Current Fiscal Year | 1,141.6 | 781.9
Financing Receivable, Originated Four Years before Current Fiscal Year | 356.2 | 298.2
Financed Receivables, By Origination Year, Prior | 117.7 | 71.0
Finance Receivables, Total | 11,057.0 | 10,210.1
Customer Retail | Fleet | Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year | 58.3 | 11.2
Financing Receivable, Originated One Year before Current Fiscal Year | 31.5 | 17.6
Financing Receivable, Originated Two Years before Current Fiscal Year | 48.6 | 13.9
Financing Receivable, Originated Three Years before Current Fiscal Year | 38.2 | 5.8
Financing Receivable, Originated Four Years before Current Fiscal Year | 17.7 | 2.1
Financed Receivables, By Origination Year, Prior | 1.2 | 0.9
Finance Receivables, Total | 195.5 | 51.5
Customer Retail | Fleet | At-risk |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year | 46.1 | 49.5
Financing Receivable, Originated One Year before Current Fiscal Year | 83.6 | 196.8
Financing Receivable, Originated Two Years before Current Fiscal Year | 156.9 | 80.8
Financing Receivable, Originated Three Years before Current Fiscal Year | 56.5 | 41.9
Financing Receivable, Originated Four Years before Current Fiscal Year | 15.8 | 6.0
Financed Receivables, By Origination Year, Prior | 9.1 | 1.5
Finance Receivables, Total | 368.0 | 376.5
Customer Retail | Owner/Operator |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year | 498.8 | 527.5
Financing Receivable, Originated One Year before Current Fiscal Year | 446.3 | 317.6
Financing Receivable, Originated Two Years before Current Fiscal Year | 243.2 | 216.4
Financing Receivable, Originated Three Years before Current Fiscal Year | 147.2 | 148.9
Financing Receivable, Originated Four Years before Current Fiscal Year | 75.2 | 59.9
Financed Receivables, By Origination Year, Prior | 19.7 | 13.2
Finance Receivables, Total | 1,430.4 | 1,283.5
Customer Retail | Owner/Operator | Charge Offs Of Finance Receivables |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year | 0.2 | 0.1
Financing Receivable, Originated One Year before Current Fiscal Year | 1.4 | 2.4
Financing Receivable, Originated Two Years before Current Fiscal Year | 1.5 | 3.7
Financing Receivable, Originated Three Years before Current Fiscal Year | 2.3 | 1.0
Financing Receivable, Originated Four Years before Current Fiscal Year | 0.5 | 1.3
Financed Receivables, By Origination Year, Prior | 0.3 | 0.8
Finance Receivables, Total | 6.2 | 9.3
Customer Retail | Owner/Operator | Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year | 494.9 | 524.1
Financing Receivable, Originated One Year before Current Fiscal Year | 438.1 | 303.7
Financing Receivable, Originated Two Years before Current Fiscal Year | 232.3 | 206.2
Financing Receivable, Originated Three Years before Current Fiscal Year | 139.0 | 145.1
Financing Receivable, Originated Four Years before Current Fiscal Year | 72.7 | 57.6
Financed Receivables, By Origination Year, Prior | 18.7 | 12.7
Finance Receivables, Total | 1,395.7 | 1,249.4
Customer Retail | Owner/Operator | Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year | 2.9 | 2.5
Financing Receivable, Originated One Year before Current Fiscal Year | 5.6 | 12.1
Financing Receivable, Originated Two Years before Current Fiscal Year | 6.7 | 8.0
Financing Receivable, Originated Three Years before Current Fiscal Year | 4.8 | 2.9
Financing Receivable, Originated Four Years before Current Fiscal Year | 1.8 | 1.3
Financed Receivables, By Origination Year, Prior | 0.5 | 0.4
Finance Receivables, Total | 22.3 | 27.2
Customer Retail | Owner/Operator | At-risk |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year | 1.0 | 0.9
Financing Receivable, Originated One Year before Current Fiscal Year | 2.6 | 1.8
Financing Receivable, Originated Two Years before Current Fiscal Year | 4.2 | 2.2
Financing Receivable, Originated Three Years before Current Fiscal Year | 3.4 | 0.9
Financing Receivable, Originated Four Years before Current Fiscal Year | 0.7 | 1.0
Financed Receivables, By Origination Year, Prior | 0.5 | 0.1
Finance Receivables, Total | $ 12.4 | $ 6.9

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