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Equity Compensation Plan - Schedule of Intrinsic Value Related to Stock Options (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]      
Options outstanding $ 6.1 $ 4.0 $ 0.5
Options exercisable $ 1.3 $ 0.6 $ 0.4