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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Restructuring Cost and Reserve [Line Items]        
Total cost of transformation program $ 3.5 $ 10.1 $ 9.4 $ 37.4
Cumulative cost incurred 88.6   88.6  
Professional Fees [Member]        
Restructuring Cost and Reserve [Line Items]        
Total cost of transformation program 0.6 2.0 1.5 4.1
Cumulative cost incurred 26.4   26.4  
Retention and Separation [Member]        
Restructuring Cost and Reserve [Line Items]        
Total cost of transformation program 2.9 7.9 7.8 33.1
Cumulative cost incurred 61.3   61.3  
Other [Member]        
Restructuring Cost and Reserve [Line Items]        
Total cost of transformation program 0.0 $ 0.2 0.1 $ 0.2
Cumulative cost incurred $ 0.9   $ 0.9