Business Combinations and Discontinued Operations - Summary of Discontinued Operations (Detail) $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($)
Discontinued Operations And Disposal Groups [Abstract]
Total revenues	$ 79.2
Earnings from operations	6.6
Loss on sale	(6.0)
Pretax earnings	0.6
Income tax expense	0.1
Net earnings	$ 0.5

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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+ Details

- Definition

Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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