Annual report [Section 13 and 15(d), not S-K Item 405]

Restructuring Activities - Schedule of Changes in the Liabilities Related to the Transformation Program (Detail)

v3.25.4
Restructuring Activities - Schedule of Changes in the Liabilities Related to the Transformation Program (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Restructuring Cost and Reserve [Line Items]      
Beginning Balance $ 4.7 $ 9.2  
Restructuring Charges, Statement of Income or Comprehensive Income [Extensible Enumeration] General and Administrative Expense General and Administrative Expense  
Expenses $ 0.0 $ 13.3 $ 54.2
Cash payments (3.0) (17.0)  
Non-cash items and other (0.4) (0.8)  
Ending Balance 1.3 4.7 9.2
Professional Fees [Member]      
Restructuring Cost and Reserve [Line Items]      
Beginning Balance 0.0 1.0  
Expenses 0.0 1.6 8.0
Cash payments 0.0 (2.6)  
Non-cash items and other 0.0 0.0  
Ending Balance 0.0 0.0 1.0
Retention and Separation [Member]      
Restructuring Cost and Reserve [Line Items]      
Beginning Balance 4.7 8.2  
Expenses 0.0 10.9 45.7
Cash payments (3.0) (14.4)  
Non-cash items and other (0.4) 0.0  
Ending Balance 1.3 4.7 8.2
Other [Member]      
Restructuring Cost and Reserve [Line Items]      
Beginning Balance 0.0 0.0  
Expenses 0.0 0.8 0.5
Cash payments 0.0 0.0  
Non-cash items and other 0.0 (0.8)  
Ending Balance $ 0.0 $ 0.0 $ 0.0