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Retirement Plans and Postretirement Benefits - Changes in Benefit Obligations and Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Change in projected benefit obligation:    
Benefit obligation at beginning of year $ 170.0 $ 0.0
Interest cost 29.3 6.2
Benefit payments (31.8) (6.6)
Net transfer in (including the effect of any business combinations/divestitures) 465.7 172.8
Actuarial gain (44.5) (3.3)
Exchange rate changes 33.2 0.9
Benefit obligation at end of year 621.9 170.0
Change in plan assets:    
Fair value of plan assets at beginning of year 185.3 0.0
Actual return on plan assets (10.3) (2.2)
Employer contributions 18.9 35.6
Benefit payments (31.8) (6.6)
Net transfer in (including effect of any business combinations/divestitures) 466.4 157.5
Exchange rate changes 34.3 1.0
Fair value of plan assets at end of year 662.8 185.3
Funded status at end of year 40.9 15.3
Amounts recognized in Consolidated Balance Sheets:    
Other non-current assets 40.9 15.3
Net amount recognized 40.9 15.3
Amounts recognized in accumulated other comprehensive income (loss) (pre-tax):    
Net actuarial loss $ (5.7) $ (7.6)