Quarterly report pursuant to Section 13 or 15(d)

Restructuring Activities - Schedule of Costs Related to the Organizational Design Transformation Program (Detail)

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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Restructuring Cost and Reserve [Line Items]        
Total cost of transformation program $ 0.0 $ 4.6 $ 9.4 $ 42.0
Cumulative cost incurred 88.6   88.6  
Professional Fees [Member]        
Restructuring Cost and Reserve [Line Items]        
Total cost of transformation program 0.0 2.1 1.5 6.2
Cumulative cost incurred 26.4   26.4  
Retention and Separation [Member]        
Restructuring Cost and Reserve [Line Items]        
Total cost of transformation program 0.0 2.2 7.8 35.3
Cumulative cost incurred 61.3   61.3  
Other [Member]        
Restructuring Cost and Reserve [Line Items]        
Total cost of transformation program 0.0 $ 0.3 0.1 $ 0.5
Cumulative cost incurred $ 0.9   $ 0.9