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Restructuring Activities - Schedule of Costs Related to the Restructuring Program (Detail) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2024 USD ($)
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Costs, Total | $ 2.7 | $ 68.2
Cumulative cost incurred | 88.6 | 88.6
Restructuring Program [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Cumulative cost incurred | 68.2 | 68.2
Professional Fees [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Costs, Total | 0.3 | 4.5
Cumulative cost incurred | 26.4 | 26.4
Professional Fees [Member] | Restructuring Program [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Cumulative cost incurred | 4.5 | 4.5
Retention and Separation [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Costs, Total | 2.4 | 63.7
Cumulative cost incurred | 61.3 | 61.3
Retention and Separation [Member] | Restructuring Program [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Cumulative cost incurred | 63.7 | 63.7
Others [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring Costs, Total | 0.0 | 0.0
Cumulative cost incurred | 0.9 | 0.9
Others [Member] | Restructuring Program [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Cumulative cost incurred | $ 0.0 | $ 0.0

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