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Business Combinations, Divestitures and Discontinued Operations - Summary of Discontinued Operations (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2022
Discontinued Operations and Disposal Groups [Abstract] |  |
Total revenues | $ 111.7 | $ 206.4
Pretax earnings from operations | 20.5 | 16.4
Pretax loss on divestiture | (1.0) | (1.0)
Pretax earnings | 19.5 | 15.4
Income tax expense | 6.2 | 5.2
Earnings from discontinued operations, net of income tax expense | $ 13.3 | $ 10.2

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