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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Discontinued Operations and Disposal Groups [Abstract] |  |  |  |
Total revenues | $ 34.5 | $ 111.7 | $ 0.0 | $ 206.4
Pretax (loss) earnings from operations | (1.4) | 20.5 | (18.5) | 16.4
Pretax gain (loss) on divestiture and sales of assets | 2.3 | (1.0) | 2.3 | (1.0)
Pretax (loss) earnings | 0.9 | 19.5 | (16.2) | 15.4
Income tax expense (benefit) | 0.2 | 6.2 | (0.0) | 5.2
Earnings (loss) from discontinued operations, net of income tax expense (benefit) | $ 0.7 | $ 13.3 | $ (12.2) | $ 10.2

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