Equipment on Operating Leases - Additional Information (Detail) $ in Millions	Dec. 31, 2020 USD ($)
Property Subject to or Available for Operating Lease [Line Items]
Minimum lease payments receivable for operating leases, in 2021	$ 13.7
Minimum lease payments receivable for operating leases, in 2022	10.6
Minimum lease payments receivable for operating leases, in 2023	5.8
Minimum lease payments receivable for operating leases, in 2024	3.2
Minimum lease payments receivable for operating leases, in 2025	2.4
Minimum lease payments receivable for operating leases, thereafter	6.0
Financial Services
Property Subject to or Available for Operating Lease [Line Items]
Minimum lease payments receivable for operating leases, in 2021	668.2
Minimum lease payments receivable for operating leases, in 2022	451.8
Minimum lease payments receivable for operating leases, in 2023	252.8
Minimum lease payments receivable for operating leases, in 2024	104.3
Minimum lease payments receivable for operating leases, in 2025	35.0
Minimum lease payments receivable for operating leases, thereafter	5.1
Truck, Parts and Other
Property Subject to or Available for Operating Lease [Line Items]
Annual amortization of deferred lease revenues, in 2021	53.6
Annual amortization of deferred lease revenues, in 2022	24.6
Annual amortization of deferred lease revenues, in 2023	12.1
Annual amortization of deferred lease revenues, in 2024	8.5
Annual amortization of deferred lease revenues, in 2025	0.2
Annual amortization of deferred lease revenues, thereafter	0.0
Annual maturities of the residual value guarantees, in 2021	179.8
Annual maturities of the residual value guarantees, in 2022	82.4
Annual maturities of the residual value guarantees, in 2023	54.2
Annual maturities of the residual value guarantees, in 2024	15.9
Annual maturities of the residual value guarantees, in 2025	15.2
Annual maturities of the residual value guarantees, thereafter	$ 10.9