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

Income Taxes - Additional Information (Detail)

v3.25.4
Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Income Taxes [Line Items]      
Income tax expense (benefit) $ 47.3 $ (84.9) $ 60.8
Intellectual property 163.6 177.6  
Deferred income tax benefit $ (64.2) (229.6) (41.1)
Deferred tax charge   $ 18.5 $ (7.4)
Effective tax rate applied 21.00% 21.00% 21.00%
Tax loss and credit carryforwards $ 234.8 $ 225.6  
Amount of tax loss and credit carryforwards that can be carried forward indefinitely 13.8    
U.S. foreign tax credit carryforwards 132.9 156.0  
State tax loss and credit carryforwards 5.0    
Valuation allowance 336.8 404.2  
Valuation allowance, deferred tax asset, change in amount   28.7  
Deferred income tax liability on unremitted foreign earnings 16.1 11.7  
Income taxes paid, net of refunds received 116.8 132.3 $ 121.2
Amount of tax loss and credit carryforwards that are subject to expiration 221.0    
Total amount of unrecognized tax benefits, including related interest and penalties 45.7 51.3 67.4
Unrecognized tax benefits excluding interest and penalties that if recognized would affect the effective tax rate 33.2 36.5  
Total accrued interest for tax contingencies 8.2 10.1 16.0
Total accrued penalties for tax contingencies 1.3 1.3 2.3
Increase (decrease) in interest expense related to uncertain tax positions (2.1) (5.3) (4.2)
Increase (decrease) in penalties to uncertain tax positions $ (0.1) (0.8) $ (1.0)
Open tax years by major tax jurisdiction 2012    
European Subsidiaries [Member]      
Income Taxes [Line Items]      
Valuation allowance, deferred tax asset, change in amount $ (67.4)    
Domestic [Member]      
Income Taxes [Line Items]      
Domestic research and development tax credit carryforward $ 22.4 $ 5.3  
Domestic [Member] | Earliest Tax Year [Member] | Research and Development [Member]      
Income Taxes [Line Items]      
Expiration year of tax credit carryforwards 2040    
United States [Member] | Earliest Tax Year [Member]      
Income Taxes [Line Items]      
Expiration year of U.S. foreign tax credit carryforwards 2026    
United States [Member] | Latest Tax Year [Member]      
Income Taxes [Line Items]      
Expiration year of U.S. foreign tax credit carryforwards 2035    
Foreign Country [Member] | Earliest Tax Year [Member]      
Income Taxes [Line Items]      
Operating loss and tax credits carryforwards foreign subject to expiration expiration year 2026    
Foreign Country [Member] | Latest Tax Year [Member]      
Income Taxes [Line Items]      
Operating loss and tax credits carryforwards foreign subject to expiration expiration year 2041    
State [Member] | Earliest Tax Year [Member]      
Income Taxes [Line Items]      
Expiration year of state tax loss carryforwards 2033    
State [Member] | Latest Tax Year [Member]      
Income Taxes [Line Items]      
Expiration year of state tax loss carryforwards 2045