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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 | Mar. 31, 2025 | Dec. 31, 2024
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Financing Receivable, Recorded Investment [Line Items] |  |
Financed Receivables, By Origination Year, Loans | $ 5,174.5 | $ 5,173.9
Financing Receivable Originated In Current Fiscal Year | 1,320.6 | 5,577.5
Financing Receivable, Originated One Year before Current Fiscal Year | 5,580.2 | 4,188.0
Financing Receivable, Originated Two Years before Current Fiscal Year | 3,930.9 | 2,482.9
Financing Receivable, Originated Three Years before Current Fiscal Year | 2,168.8 | 1,173.4
Financing Receivable, Originated Four Years before Current Fiscal Year | 889.2 | 468.8
Financed Receivables, By Origination Year, Prior | 513.8 | 228.6
Finance Receivables, Total | 19,578.0 | 19,293.1
Charge Offs Of Finance Receivables |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year | 0.2 | 1.0
Financing Receivable, Originated One Year before Current Fiscal Year | 5.2 | 21.8
Financing Receivable, Originated Two Years before Current Fiscal Year | 12.9 | 15.8
Financing Receivable, Originated Three Years before Current Fiscal Year | 2.6 | 8.5
Financing Receivable, Originated Four Years before Current Fiscal Year | 1.3 | 5.5
Financed Receivables, By Origination Year, Prior | 0.8 | 8.6
Finance Receivables, Total | 23.0 | 61.2
Dealer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financed Receivables, By Origination Year, Loans | 5,174.5 | 5,173.9
Financing Receivable Originated In Current Fiscal Year | 126.6 | 682.8
Financing Receivable, Originated One Year before Current Fiscal Year | 650.1 | 664.6
Financing Receivable, Originated Two Years before Current Fiscal Year | 609.2 | 410.7
Financing Receivable, Originated Three Years before Current Fiscal Year | 384.7 | 194.9
Financing Receivable, Originated Four Years before Current Fiscal Year | 177.1 | 102.6
Financed Receivables, By Origination Year, Prior | 204.9 | 142.0
Finance Receivables, Total | 7,327.1 | 7,371.5
Dealer | Wholesale |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financed Receivables, By Origination Year, Loans | 4,947.3 | 4,944.1
Finance Receivables, Total | 4,947.3 | 4,944.1
Dealer | Wholesale | Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financed Receivables, By Origination Year, Loans | 4,940.6 | 4,936.1
Finance Receivables, Total | 4,940.6 | 4,936.1
Dealer | Wholesale | Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financed Receivables, By Origination Year, Loans | 6.7 | 7.1
Finance Receivables, Total | 6.7 | 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 | 227.2 | 229.8
Financing Receivable Originated In Current Fiscal Year | 126.6 | 682.8
Financing Receivable, Originated One Year before Current Fiscal Year | 650.1 | 664.6
Financing Receivable, Originated Two Years before Current Fiscal Year | 609.2 | 410.7
Financing Receivable, Originated Three Years before Current Fiscal Year | 384.7 | 194.9
Financing Receivable, Originated Four Years before Current Fiscal Year | 177.1 | 102.6
Financed Receivables, By Origination Year, Prior | 204.9 | 142.0
Finance Receivables, Total | 2,379.8 | 2,427.4
Dealer | Retail | Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financed Receivables, By Origination Year, Loans | 227.2 | 229.8
Financing Receivable Originated In Current Fiscal Year | 120.7 | 680.8
Financing Receivable, Originated One Year before Current Fiscal Year | 648.1 | 641.5
Financing Receivable, Originated Two Years before Current Fiscal Year | 595.3 | 404.6
Financing Receivable, Originated Three Years before Current Fiscal Year | 379.0 | 192.8
Financing Receivable, Originated Four Years before Current Fiscal Year | 175.3 | 98.0
Financed Receivables, By Origination Year, Prior | 201.8 | 141.6
Finance Receivables, Total | 2,347.4 | 2,389.1
Dealer | Retail | Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year | 5.9 | 2.0
Financing Receivable, Originated One Year before Current Fiscal Year | 2.0 | 23.1
Financing Receivable, Originated Two Years before Current Fiscal Year | 13.9 | 6.1
Financing Receivable, Originated Three Years before Current Fiscal Year | 5.7 | 2.1
Financing Receivable, Originated Four Years before Current Fiscal Year | 1.8 | 4.6
Financed Receivables, By Origination Year, Prior | 3.1 | 0.4
Finance Receivables, Total | 32.4 | 38.3
Customer Retail |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year | 1,194.0 | 4,894.7
Financing Receivable, Originated One Year before Current Fiscal Year | 4,930.1 | 3,523.4
Financing Receivable, Originated Two Years before Current Fiscal Year | 3,321.7 | 2,072.2
Financing Receivable, Originated Three Years before Current Fiscal Year | 1,784.1 | 978.5
Financing Receivable, Originated Four Years before Current Fiscal Year | 712.1 | 366.2
Financed Receivables, By Origination Year, Prior | 308.9 | 86.6
Finance Receivables, Total | 12,250.9 | 11,921.6
Customer Retail | Fleet |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year | 1,035.0 | 4,367.2
Financing Receivable, Originated One Year before Current Fiscal Year | 4,406.1 | 3,205.8
Financing Receivable, Originated Two Years before Current Fiscal Year | 3,033.0 | 1,855.8
Financing Receivable, Originated Three Years before Current Fiscal Year | 1,593.6 | 829.6
Financing Receivable, Originated Four Years before Current Fiscal Year | 595.5 | 306.3
Financed Receivables, By Origination Year, Prior | 261.1 | 73.4
Finance Receivables, Total | 10,924.3 | 10,638.1
Customer Retail | Fleet | Charge Offs Of Finance Receivables |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year | 0.1 | 0.9
Financing Receivable, Originated One Year before Current Fiscal Year | 4.9 | 19.4
Financing Receivable, Originated Two Years before Current Fiscal Year | 12.5 | 12.1
Financing Receivable, Originated Three Years before Current Fiscal Year | 1.8 | 7.5
Financing Receivable, Originated Four Years before Current Fiscal Year | 1.3 | 4.2
Financed Receivables, By Origination Year, Prior | 0.6 | 7.8
Finance Receivables, Total | 21.2 | 51.9
Customer Retail | Fleet | Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year | 1,027.2 | 4,306.5
Financing Receivable, Originated One Year before Current Fiscal Year | 4,326.3 | 2,991.4
Financing Receivable, Originated Two Years before Current Fiscal Year | 2,826.7 | 1,761.1
Financing Receivable, Originated Three Years before Current Fiscal Year | 1,492.3 | 781.9
Financing Receivable, Originated Four Years before Current Fiscal Year | 556.5 | 298.2
Financed Receivables, By Origination Year, Prior | 255.7 | 71.0
Finance Receivables, Total | 10,484.7 | 10,210.1
Customer Retail | Fleet | Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year | 6.3 | 11.2
Financing Receivable, Originated One Year before Current Fiscal Year | 19.2 | 17.6
Financing Receivable, Originated Two Years before Current Fiscal Year | 48.7 | 13.9
Financing Receivable, Originated Three Years before Current Fiscal Year | 46.0 | 5.8
Financing Receivable, Originated Four Years before Current Fiscal Year | 24.2 | 2.1
Financed Receivables, By Origination Year, Prior | 2.9 | 0.9
Finance Receivables, Total | 147.3 | 51.5
Customer Retail | Fleet | At-risk |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year | 1.5 | 49.5
Financing Receivable, Originated One Year before Current Fiscal Year | 60.6 | 196.8
Financing Receivable, Originated Two Years before Current Fiscal Year | 157.6 | 80.8
Financing Receivable, Originated Three Years before Current Fiscal Year | 55.3 | 41.9
Financing Receivable, Originated Four Years before Current Fiscal Year | 14.8 | 6.0
Financed Receivables, By Origination Year, Prior | 2.5 | 1.5
Finance Receivables, Total | 292.3 | 376.5
Customer Retail | Owner/Operator |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year | 159.0 | 527.5
Financing Receivable, Originated One Year before Current Fiscal Year | 524.0 | 317.6
Financing Receivable, Originated Two Years before Current Fiscal Year | 288.7 | 216.4
Financing Receivable, Originated Three Years before Current Fiscal Year | 190.5 | 148.9
Financing Receivable, Originated Four Years before Current Fiscal Year | 116.6 | 59.9
Financed Receivables, By Origination Year, Prior | 47.8 | 13.2
Finance Receivables, Total | 1,326.6 | 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 | 0.1 | 0.1
Financing Receivable, Originated One Year before Current Fiscal Year | 0.3 | 2.4
Financing Receivable, Originated Two Years before Current Fiscal Year | 0.4 | 3.7
Financing Receivable, Originated Three Years before Current Fiscal Year | 0.8 | 1.0
Financing Receivable, Originated Four Years before Current Fiscal Year |  | 1.3
Financed Receivables, By Origination Year, Prior | 0.2 | 0.8
Finance Receivables, Total | 1.8 | 9.3
Customer Retail | Owner/Operator | Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year | 159.0 | 524.1
Financing Receivable, Originated One Year before Current Fiscal Year | 517.7 | 303.7
Financing Receivable, Originated Two Years before Current Fiscal Year | 277.4 | 206.2
Financing Receivable, Originated Three Years before Current Fiscal Year | 183.4 | 145.1
Financing Receivable, Originated Four Years before Current Fiscal Year | 113.5 | 57.6
Financed Receivables, By Origination Year, Prior | 45.7 | 12.7
Finance Receivables, Total | 1,296.7 | 1,249.4
Customer Retail | Owner/Operator | Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year |  | 2.5
Financing Receivable, Originated One Year before Current Fiscal Year | 3.9 | 12.1
Financing Receivable, Originated Two Years before Current Fiscal Year | 5.7 | 8.0
Financing Receivable, Originated Three Years before Current Fiscal Year | 4.3 | 2.9
Financing Receivable, Originated Four Years before Current Fiscal Year | 1.7 | 1.3
Financed Receivables, By Origination Year, Prior | 0.9 | 0.4
Finance Receivables, Total | 16.5 | 27.2
Customer Retail | Owner/Operator | At-risk |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Financing Receivable Originated In Current Fiscal Year |  | 0.9
Financing Receivable, Originated One Year before Current Fiscal Year | 2.4 | 1.8
Financing Receivable, Originated Two Years before Current Fiscal Year | 5.6 | 2.2
Financing Receivable, Originated Three Years before Current Fiscal Year | 2.8 | 0.9
Financing Receivable, Originated Four Years before Current Fiscal Year | 1.4 | 1.0
Financed Receivables, By Origination Year, Prior | 1.2 | 0.1
Finance Receivables, Total | $ 13.4 | $ 6.9

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