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Income Taxes - Narrative (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Income Tax Disclosure [Abstract] |  |  |  |
Effective Income Tax Rate Reconciliation, Percent |  |  | 24.30% | 24.50%
Effective Income Tax Rate Reconciliation, Disposition of Business, Percent |  |  | 25.20% | 25.00%
Income Tax Expense (Benefit) | $ (3.3) | $ 3.7 | $ (17.4) | $ 16.7
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 21.00% |

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