Schedule of Balance Sheet Information Related to Leases (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
OPERATING LEASES
Total right-of-use assets	$ 35.8	$ 39.9
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Total lease liabilities	$ 36.1	$ 40.3
FINANCE LEASES
Total right-of-use assets	$ 0.9	$ 1.0
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Total lease liabilities	$ 0.9	$ 1.0
Truck, Parts and Other
OPERATING LEASES
Total right-of-use assets	29.8	30.9
Accounts payable, accrued expenses and other	$ 12.8	$ 11.4
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accounts payable, accrued expenses and other	Accounts payable, accrued expenses and other
Other liabilities	$ 17.6	$ 20.3
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities
FINANCE LEASES
Total right-of-use assets	$ 0.9	$ 1.0
Accounts payable, accrued expenses and other	$ 0.4	$ 0.5
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accounts payable, accrued expenses and other	Accounts payable, accrued expenses and other
Other liabilities	$ 0.5	$ 0.5
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities
Financial Services
OPERATING LEASES
Total right-of-use assets	$ 6.0	$ 9.0
Financial Services | Accounts Payable, Accrued Expense and Other
OPERATING LEASES
Total lease liabilities	1.5	2.0
Financial Services | Deferred Taxes and Other Liabilities
OPERATING LEASES
Total lease liabilities	$ 4.2	$ 6.6