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Earnings Per Share - Additional Information (Detail) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Anti-dilutive stock-based awards shares outstanding 1.6 0.0 1.2 1.0