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