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Restructuring Activities - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 30, 2025 | Mar. 31, 2025 | Mar. 31, 2024
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs |  | $ 3.3 | $ 16.7
Total cost of transformation program |  | 0.0 | 5.9
Expenses recognized under technology realignment program |  | 0.0 |
Restructuring Program [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs |  | 3.3 | 16.7
Subsequent Event [Member] | Technology Realignment Program [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Expected Pre-tax charges | $ 5.0 |  |
Minimum [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Expected Pre-tax charges |  | 92.5 |
Minimum [Member] | Restructuring Program [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Expected Pre-tax charges |  | $ 72.4 | $ 74.0

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