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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Reconciliation of reportable segment Adjusted EBITDA to income before income tax expense: |  |  |  |
Total reportable segment Adjusted EBITDA | $ 278.2 | $ 248.8 | $ 554.9 | $ 489.0
Less: |  |  |  |
Depreciation expense | 50.5 | 47.0 | 100.3 | 94.4
Unallocated general and administrative expenses | 1.7 | 2.0 | 3.9 | 4.5
Interest expense, net | 49.7 | 43.8 | 98.2 | 85.4
Income before income tax expense | $ 176.3 | $ 156.0 | $ 352.5 | $ 304.7

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