v3.25.4
Employee benefit plans - changes in benefit obligations and plan assets and funded status (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
United States | Pension plans    
Benefit obligation:    
Beginning balance $ 119.7 $ 164.6
Service cost 0.8 1.9
Interest cost 0.9 8.1
Employee contributions 0.0 0.0
Actuarial (gain) loss (2.2) 8.5
Benefits paid (0.7) (9.2)
Settlements and curtailments (110.9) (54.2)
Currency translation 0.0 0.0
Other (0.1) 0.0
Ending balance 7.5 119.7
Fair value of plan assets:    
Beginning balance 153.7 214.7
Return (loss) on plan assets 0.6 1.7
Employer contributions 0.7  
Employer contributions   0.7
Employee contributions 0.0 0.0
Benefits paid (0.7) (9.2)
Settlements and curtailments (110.9) (54.2)
Currency translation 0.0 0.0
Other1 (43.4) 0.0
Ending balance 0.0 153.7
Funded status at end of year (7.5) 34.0
United States | Medical plans    
Benefit obligation:    
Beginning balance 9.8 10.6
Service cost 0.1 0.1
Interest cost 0.6 0.5
Employee contributions 0.0 0.0
Actuarial (gain) loss 0.9 (1.0)
Benefits paid (0.4) (0.4)
Settlements and curtailments 0.0 0.0
Currency translation 0.0 0.0
Other 0.0 0.0
Ending balance 11.0 9.8
Fair value of plan assets:    
Beginning balance 0.0 0.0
Return (loss) on plan assets 0.0 0.0
Employer contributions 0.4 0.4
Employee contributions 0.0 0.0
Benefits paid (0.4) (0.4)
Settlements and curtailments 0.0 0.0
Currency translation 0.0 0.0
Other1 0.0 0.0
Ending balance 0.0 0.0
Funded status at end of year (11.0) (9.8)
Non-U.S. | Pension plans    
Benefit obligation:    
Beginning balance 179.0 200.7
Service cost 3.4 3.2
Interest cost 6.8 6.8
Employee contributions 1.3 1.1
Actuarial (gain) loss (11.4) (7.9)
Benefits paid (7.6) (7.7)
Settlements and curtailments (8.2) (9.0)
Currency translation 20.1 (9.5)
Other 1.9 1.3
Ending balance 185.3 179.0
Fair value of plan assets:    
Beginning balance 109.0 124.8
Return (loss) on plan assets 5.5 (3.5)
Employer contributions 6.5 6.3
Employee contributions 1.3 1.1
Benefits paid (7.6) (7.7)
Settlements and curtailments (7.4) (9.0)
Currency translation 10.8 (4.4)
Other1 2.1 1.4
Ending balance 120.2 109.0
Funded status at end of year $ (65.1) $ (70.0)