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Divestitures, Discontinued Operations and Assets and Liabilities Held for Sale - Summary of Discontinued Operations (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Discontinued Operations and Disposal Groups [Abstract] |  |  |  |
Total revenues | $ 27.2 | $ 62.4 | $ 86.4 | $ 268.8
Pretax earnings (loss) from discontinued operations | 3.9 | 4.7 | (14.6) | 21.1
Pretax (loss) gain on divestitures and sales of assets | (21.9) | 0.7 | (19.6) | (0.3)
Pretax (loss) earnings | (18.0) | 5.4 | (34.2) | 20.8
Income tax (benefit) expense | (4.4) | 1.3 | (8.4) | 6.5
(Loss) Earnings from discontinued operations, net of income tax (benefit) expense | $ (13.6) | $ 4.1 | $ (25.8) | $ 14.3

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