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Restructuring Activities - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2021
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Total cost of transformation program | $ 0.0 |  | $ 4.6 | $ 9.4 | $ 42.0 |
Restructuring Program [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Total cost of transformation program | $ 2.7 |  |  | 68.2 |  |
Minimum [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected Pre-tax charges |  |  |  | 88.6 |  |
Minimum [Member] | Organizational Design Transformation Program |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected Pre-tax charges |  |  |  |  |  | $ 90.0
Minimum [Member] | Restructuring Program [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected Pre-tax charges |  | $ 70.0 |  | $ 68.2 |  |

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