v3.25.4
Employee benefit plans - allocation of plan assets (Details) - Pension plans - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
United States      
Defined benefit plan, information about plan assets      
Plan assets $ 0.0 $ 153.7 $ 214.7
United States | Cash      
Defined benefit plan, information about plan assets      
Plan assets 0.0 25.4  
United States | Fixed income      
Defined benefit plan, information about plan assets      
Plan assets 0.0 122.8  
United States | Equity      
Defined benefit plan, information about plan assets      
Plan assets 0.0 5.5  
United States | Level 1      
Defined benefit plan, information about plan assets      
Plan assets 0.0 54.2  
United States | Level 1 | Cash      
Defined benefit plan, information about plan assets      
Plan assets 0.0 25.4  
United States | Level 1 | Fixed income      
Defined benefit plan, information about plan assets      
Plan assets 0.0 23.3  
United States | Level 1 | Equity      
Defined benefit plan, information about plan assets      
Plan assets 0.0 5.5  
United States | Level 2      
Defined benefit plan, information about plan assets      
Plan assets 0.0 99.5  
United States | Level 2 | Cash      
Defined benefit plan, information about plan assets      
Plan assets 0.0 0.0  
United States | Level 2 | Fixed income      
Defined benefit plan, information about plan assets      
Plan assets 0.0 99.5  
United States | Level 2 | Equity      
Defined benefit plan, information about plan assets      
Plan assets 0.0 0.0  
United States | Level 3      
Defined benefit plan, information about plan assets      
Plan assets 0.0 0.0  
United States | Level 3 | Cash      
Defined benefit plan, information about plan assets      
Plan assets 0.0 0.0  
United States | Level 3 | Fixed income      
Defined benefit plan, information about plan assets      
Plan assets 0.0 0.0  
United States | Level 3 | Equity      
Defined benefit plan, information about plan assets      
Plan assets 0.0 0.0  
United States | Fair Value Measured at Net Asset Value Per Share      
Defined benefit plan, information about plan assets      
Plan assets 0.0 0.0  
Non-U.S.      
Defined benefit plan, information about plan assets      
Plan assets 120.2 109.0 124.8
Non-U.S. | Cash      
Defined benefit plan, information about plan assets      
Plan assets 1.0 1.2  
Non-U.S. | Fixed income      
Defined benefit plan, information about plan assets      
Plan assets 56.7 46.5  
Non-U.S. | Equity      
Defined benefit plan, information about plan assets      
Plan assets 17.8 20.0  
Non-U.S. | Other      
Defined benefit plan, information about plan assets      
Plan assets 2.0 2.9  
Non-U.S. | Insurance contracts      
Defined benefit plan, information about plan assets      
Plan assets 42.7 38.4  
Non-U.S. | Level 1      
Defined benefit plan, information about plan assets      
Plan assets 1.0 1.2  
Non-U.S. | Level 1 | Cash      
Defined benefit plan, information about plan assets      
Plan assets 1.0 1.2  
Non-U.S. | Level 1 | Fixed income      
Defined benefit plan, information about plan assets      
Plan assets 0.0 0.0  
Non-U.S. | Level 1 | Equity      
Defined benefit plan, information about plan assets      
Plan assets 0.0 0.0  
Non-U.S. | Level 1 | Other      
Defined benefit plan, information about plan assets      
Plan assets 0.0 0.0  
Non-U.S. | Level 1 | Insurance contracts      
Defined benefit plan, information about plan assets      
Plan assets 0.0 0.0  
Non-U.S. | Level 2      
Defined benefit plan, information about plan assets      
Plan assets 59.1 55.4  
Non-U.S. | Level 2 | Cash      
Defined benefit plan, information about plan assets      
Plan assets 0.0 0.0  
Non-U.S. | Level 2 | Fixed income      
Defined benefit plan, information about plan assets      
Plan assets 44.7 42.3  
Non-U.S. | Level 2 | Equity      
Defined benefit plan, information about plan assets      
Plan assets 12.9 11.8  
Non-U.S. | Level 2 | Other      
Defined benefit plan, information about plan assets      
Plan assets 1.5 1.3  
Non-U.S. | Level 2 | Insurance contracts      
Defined benefit plan, information about plan assets      
Plan assets 0.0 0.0  
Non-U.S. | Level 3      
Defined benefit plan, information about plan assets      
Plan assets 42.7 38.4 $ 45.7
Non-U.S. | Level 3 | Cash      
Defined benefit plan, information about plan assets      
Plan assets 0.0 0.0  
Non-U.S. | Level 3 | Fixed income      
Defined benefit plan, information about plan assets      
Plan assets 0.0 0.0  
Non-U.S. | Level 3 | Equity      
Defined benefit plan, information about plan assets      
Plan assets 0.0 0.0  
Non-U.S. | Level 3 | Other      
Defined benefit plan, information about plan assets      
Plan assets 0.0 0.0  
Non-U.S. | Level 3 | Insurance contracts      
Defined benefit plan, information about plan assets      
Plan assets 42.7 38.4  
Non-U.S. | Fair Value Measured at Net Asset Value Per Share      
Defined benefit plan, information about plan assets      
Plan assets 17.4 14.0  
Non-U.S. | Fair Value Measured at Net Asset Value Per Share | Fixed income      
Defined benefit plan, information about plan assets      
Plan assets 12.0 4.2  
Non-U.S. | Fair Value Measured at Net Asset Value Per Share | Equity      
Defined benefit plan, information about plan assets      
Plan assets 4.9 8.2  
Non-U.S. | Fair Value Measured at Net Asset Value Per Share | Other      
Defined benefit plan, information about plan assets      
Plan assets $ 0.5 $ 1.6