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Pension and Post-Employment Benefits - Fair Value of Pension Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Fair value of pension assets    
Total plan assets $ 2.4 $ 35.1
Non-US [Member]    
Fair value of pension assets    
Debt securities   443.4
Cash 2.5 15.8
Total plan assets 2.5 459.2
Non-US [Member] | Debt Securities Issued by Non-U.S. Government and Government Agencies [Member]    
Fair value of pension assets    
Debt securities   4.7
Non-US [Member] | Insurance Contracts [Member]    
Fair value of pension assets    
Debt securities   438.7
Non-US [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair value of pension assets    
Debt securities   4.7
Cash 2.5 15.8
Total plan assets 2.5 20.5
Non-US [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Debt Securities Issued by Non-U.S. Government and Government Agencies [Member]    
Fair value of pension assets    
Debt securities   4.7
Non-US [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair value of pension assets    
Debt securities   0.0
Total plan assets 0.0 0.0
Non-US [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair value of pension assets    
Debt securities   438.7
Total plan assets $ 0.0 438.7
Non-US [Member] | Significant Unobservable Inputs (Level 3) [Member] | Insurance Contracts [Member] | Other Asset Backed Securitites [Member]    
Fair value of pension assets    
Debt securities   $ 438.7