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Reclassifications out of Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ 1,211.2    
Other comprehensive income/(losses) before reclassifications 55.4 $ (20.1)  
Amounts reclassified from AOCL 0.0 98.5  
Actuarial net losses arising during the year 0.9 (21.3) $ (17.5)
Net current period other comprehensive income/(losses) 56.3 57.1  
Ending Balance 1,326.1 1,211.2  
Accumulated Other Comprehensive Loss [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (91.0) (148.1)  
Actuarial net losses arising during the year 0.9 (21.3) (17.5)
Ending Balance (34.7) (91.0) (148.1)
Defined Benefit Pension Plan Items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 0.0 (77.2)  
Other comprehensive income/(losses) before reclassifications 0.0 0.0  
Amounts reclassified from AOCL 0.0 98.5  
Actuarial net losses arising during the year 0.9 (21.3)  
Net current period other comprehensive income/(losses) 0.9 77.2  
Ending Balance 0.9 0.0 (77.2)
Foreign Currency Translation Items [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (91.0) (70.9)  
Other comprehensive income/(losses) before reclassifications 55.4 (20.1)  
Amounts reclassified from AOCL 0.0 0.0  
Actuarial net losses arising during the year 0.0 0.0  
Net current period other comprehensive income/(losses) 55.4 (20.1)  
Ending Balance $ (35.6) $ (91.0) $ (70.9)