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Restructuring Activities - Schedule of Costs Related to the Organizational Design Transformation Program (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total cost of transformation program | $ 0.0 | $ 0.0 | $ 0.0 | $ 9.4
Cumulative cost incurred | 92.5 |  | 92.5 |
Professional Fees [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total cost of transformation program | 0.0 | 0.0 | 0.0 | 1.5
Cumulative cost incurred | 26.5 |  | 26.5 |
Retention and Separation [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total cost of transformation program | 0.0 | 0.0 | 0.0 | 7.8
Cumulative cost incurred | 64.4 |  | 64.4 |
Other [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total cost of transformation program | 0.0 | $ 0.0 | 0.0 | $ 0.1
Cumulative cost incurred | $ 1.6 |  | $ 1.6 |

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