Equipment on Operating Leases - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 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	$ 333.4
Minimum lease payments receivable for operating leases, in 2020	536.4
Minimum lease payments receivable for operating leases, in 2021	368.4
Minimum lease payments receivable for operating leases, in 2022	187.5
Minimum lease payments receivable for operating leases, in 2023	75.2
Minimum lease payments receivable for operating leases, thereafter	23.6
Truck, Parts and Other
Property Subject to or Available for Operating Lease [Line Items]
Annual amortization of deferred lease revenues, for the remainder 2019	53.3
Annual amortization of deferred lease revenues, in 2020	80.5
Annual amortization of deferred lease revenues, in 2021	45.3
Annual amortization of deferred lease revenues, in 2022	22.8
Annual amortization of deferred lease revenues, in 2023	8.8
Annual amortization of deferred lease revenues, thereafter	0.6
Annual maturities of the residual value guarantees, for the remainder of 2019	108.7
Annual maturities of the residual value guarantees, in 2020	159.7
Annual maturities of the residual value guarantees, in 2021	147.6
Annual maturities of the residual value guarantees, in 2022	52.0
Annual maturities of the residual value guarantees, in 2023	50.6
Annual maturities of the residual value guarantees, thereafter	$ 23.1
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