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Stock and Incentive Programs for Employees and Directors - Performance Share Units - Narrative (Detail)
shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unrecognized share-based compensation cost $ 6.4
Unrecognized compensation expense, weighted-average period of recognition 1 year 10 months 24 days
Performance share units  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Accelerated vested shares | shares 1,726
Unrecognized share-based compensation cost $ 3.2
Unrecognized compensation expense, weighted-average period of recognition 1 year 9 months 18 days