Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Allowance for losses on receivables	$ 14.9	$ 15.2
Other	7.6	5.3
Deferred tax liabilities:
Depreciation	(495.7)	(485.1)
Other	(3.1)	(2.9)
Net deferred tax liability	$ (476.3)	$ (467.5)