Residual Value Obligation and Deferred Lease Revenue (Detail) - Truck, Parts and Other - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Property Subject to or Available for Operating Lease [Line Items]
Residual value guarantees	$ 591.1	$ 909.8
Deferred lease revenues	251.3	429.2
Residual value guarantees and deferred revenues, Total	$ 842.4	$ 1,339.0