Schedule of Balance Sheet Information Related to Leases (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
OPERATING LEASES
Total right-of-use assets	$ 42.9	$ 35.8
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Total lease liabilities	$ 42.9	$ 36.1
FINANCE LEASES
Total right-of-use assets	$ 2.7	$ 0.9
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Total lease liabilities	$ 2.6	$ 0.9
Truck, Parts and Other
OPERATING LEASES
Total right-of-use assets	36.9	29.8
Accounts payable, accrued expenses and other	$ 11.3	$ 12.8
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accounts payable, accrued expenses and other	Accounts payable, accrued expenses and other
Other liabilities	$ 25.8	$ 17.6
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities
FINANCE LEASES
Total right-of-use assets	$ 2.7	$ 0.9
Accounts payable, accrued expenses and other	$ 0.8	$ 0.4
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accounts payable, accrued expenses and other	Accounts payable, accrued expenses and other
Other liabilities	$ 1.8	$ 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	$ 6.0
Financial Services | Accounts Payable, Accrued Expense and Other
OPERATING LEASES
Total lease liabilities	1.4	1.5
Financial Services | Deferred Taxes and Other Liabilities
OPERATING LEASES
Total lease liabilities	$ 4.4	$ 4.2