Segments - Reconciliation of Reportable Segment Adjusted EBITDA to Income Before Income Tax Expense (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reconciliation of reportable segment Adjusted EBITDA to income before income tax expense:
Total reportable segment Adjusted EBITDA	$ 1,145.6	$ 1,025.8	$ 985.0
Less:
Depreciation expense	203.1	192.5	181.3
Unallocated general and administrative expenses	9.5	8.7	7.2
Interest expense, net	202.2	179.0	149.3
Income before income tax expense	$ 730.8	$ 645.6	$ 647.2