Schedule of Balance Sheet Information Related to Leases (Detail) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
OPERATING LEASES
Total right-of-use assets	$ 70.4	$ 70.9
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets, Other noncurrent assets, net	Other assets, Other noncurrent assets, net
Total lease liabilities	$ 71.5	$ 71.5
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Accounts Payable and Other Accrued Liabilities, Other Liabilities, Noncurrent, Deferred Tax Liabilities And Other Liabilities	Accounts Payable and Other Accrued Liabilities, Other Liabilities, Noncurrent, Deferred Tax Liabilities And Other Liabilities
FINANCE LEASES
Total right-of-use assets	$ 1.7	$ 2.5
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets, Other noncurrent assets, net	Other assets, Other noncurrent assets, net
Total lease liabilities	$ 1.6	$ 2.4
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Accounts Payable and Other Accrued Liabilities, Other Liabilities, Noncurrent, Deferred Tax Liabilities And Other Liabilities	Accounts Payable and Other Accrued Liabilities, Other Liabilities, Noncurrent, Deferred Tax Liabilities And Other Liabilities
Truck, Parts and Other
OPERATING LEASES
Total right-of-use assets	$ 65.6	$ 64.9
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other noncurrent assets, net	Other noncurrent assets, net
Accounts payable, accrued expenses and other	$ 16.3	$ 14.2
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accounts payable, accrued expenses and other	Accounts payable, accrued expenses and other
Other liabilities	$ 50.6	$ 51.6
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities
FINANCE LEASES
Total right-of-use assets	$ 1.7	$ 2.5
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other noncurrent assets, net	Other noncurrent assets, net
Accounts payable, accrued expenses and other	$ 0.7	$ 0.8
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accounts payable, accrued expenses and other	Accounts payable, accrued expenses and other
Other liabilities	$ 0.9	$ 1.6
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities
Financial Services
OPERATING LEASES
Total right-of-use assets	$ 4.8	$ 6.0
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Financial Services | Accounts Payable, Accrued Expense and Other
OPERATING LEASES
Total lease liabilities	$ 1.7	$ 1.8
Financial Services | Deferred Taxes and Other Liabilities
OPERATING LEASES
Total lease liabilities	$ 2.9	$ 3.9