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Post Retirement Benefit Plans - Changes in Benefit Obligations and Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Change in benefit obligation:      
Benefit obligation at beginning of year $ 256.1 $ 197.8  
Service cost 7.1 5.5 $ 6.5
Interest cost 4.4 5.2 1.0
Plan participant contributions 7.5 6.4  
Plan amendments 12.6 (2.4)  
Plan settlements (1.3) 0.0  
Benefits paid (5.0) (6.8)  
Actuarial gain 11.6 27.5  
Premiums paid (2.5) (2.3)  
Plan combinations / acquisitions 24.1 6.1  
Impact of foreign currency exchange rates (20.0) 19.1  
Benefit obligation at end of year 294.6 256.1 197.8
Change in plan assets:      
Fair value of plan assets at beginning of year 177.4 150.3  
Return on plan assets 2.6 1.5  
Plan participant and employer contributions 17.3 14.4  
Benefits paid (5.0) (6.8)  
Plan settlements (1.3) 0.0  
Premiums paid (2.5) (2.3)  
Plan combinations / acquisitions 14.4 4.8  
Impact of foreign currency exchange rates (13.8) 15.5  
Fair value of plan assets at end of year 189.1 177.4 $ 150.3
Net under funded status (105.5) (78.7)  
Accumulated benefit obligation $ 270.2 $ 226.4