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Segments - Reconciliation of Reportable Segment Adjusted EBITDA to Income Before Income Tax Expense (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Reconciliation of reportable segment Adjusted EBITDA to income before income tax expense:        
Total reportable segment Adjusted EBITDA $ 318.8 $ 278.2 $ 613.6 $ 554.9
Less:        
Depreciation expense 51.8 50.5 103.3 100.3
Unallocated general and administrative expenses 2.8 1.7 5.3 3.9
Interest expense, net 55.4 49.7 111.8 98.2
Income before income tax expense $ 208.8 $ 176.3 $ 393.2 $ 352.5