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Shareholders' Equity - Reconciliation of Weighted Average Number of Shares (Detail) - shares shares in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Weighted average number of common shares outstanding (in shares) | 56.5 | 57.0
Director Plan and deferred stock units (in shares) | 0.2 | 0.2
ESOP (in shares) | 0.2 | 0.2
Common shares outstanding - basic (in shares) | 56.9 | 57.4
Common and potential common shares outstanding - diluted (in shares) | 57.2 | 58.1
Restricted stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Dilutive effect of stock (in shares) | 0.2 | 0.4
Stock options award |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Dilutive effect of stock (in shares) | 0.1 | 0.3

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