Equipment on Operating Leases - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Financial Services
Property Subject to or Available for Operating Lease [Line Items]
Minimum lease payments receivable for operating leases, for the remainder of 2019	$ 173.4
Minimum lease payments receivable for operating leases, in 2020	586.0
Minimum lease payments receivable for operating leases, in 2021	420.0
Minimum lease payments receivable for operating leases, in 2022	234.3
Minimum lease payments receivable for operating leases, in 2023	103.5
Minimum lease payments receivable for operating leases, thereafter	36.0
Truck, Parts and Other
Property Subject to or Available for Operating Lease [Line Items]
Annual amortization of deferred lease revenues, for the remainder 2019	24.6
Annual amortization of deferred lease revenues, in 2020	77.5
Annual amortization of deferred lease revenues, in 2021	43.7
Annual amortization of deferred lease revenues, in 2022	21.8
Annual amortization of deferred lease revenues, in 2023	11.0
Annual amortization of deferred lease revenues, thereafter	0.6
Annual maturities of the residual value guarantees, for the remainder of 2019	49.4
Annual maturities of the residual value guarantees, in 2020	155.2
Annual maturities of the residual value guarantees, in 2021	141.4
Annual maturities of the residual value guarantees, in 2022	51.1
Annual maturities of the residual value guarantees, in 2023	47.7
Annual maturities of the residual value guarantees, thereafter	$ 22.0
Minimum
Property Subject to or Available for Operating Lease [Line Items]
Lease and guarantee periods (in years)	3 years
Estimated useful lives of equipment	3 years
Maximum
Property Subject to or Available for Operating Lease [Line Items]
Lease and guarantee periods (in years)	5 years
Estimated useful lives of equipment	9 years