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Reconciliation of Weighted Average Shares Outstanding - Reconciliation of Basic to Diluted Shares Outstanding (Detail) - shares
shares in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Earnings Per Share [Abstract]      
Basic (in shares) 181.8 183.2 183.9
Dilutive effect of shares issuable under stock-based compensation plans (in shares) 0.9 0.8 0.8
Diluted (in shares) 182.7 184.0 184.7
Anti-dilutive options to purchase common shares and restricted stock as well as contingently issuable restricted stock which are excluded from the table above (in shares) 0.4 0.5 0.5