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Reconciliation of Weighted Average Shares Outstanding - Reconciliation of Basic to Diluted Shares Outstanding (Detail) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Earnings Per Share [Abstract]        
Basic (in shares) 181.7 183.3 182.2 183.4
Dilutive effect of shares issuable under stock-based compensation plans (in shares) 0.8 0.7 0.8 0.7
Diluted (in shares) 182.5 184.0 183.0 184.1
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) 0.3 0.4 0.4 0.5