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Retirement Benefits - Information Comparing Plan Assets to Plan Obligations (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Total    
Information for pension plans with an ABO in excess of plan assets:    
Fair value of plan assets $ 92.0 $ 697.7
Accumulated benefit obligation 197.4 825.9
Projected benefit obligation 220.2 852.8
U.S. Plans    
Information for pension plans with an ABO in excess of plan assets:    
Fair value of plan assets 0.0 611.6
Accumulated benefit obligation 6.2 629.2
Projected benefit obligation 6.2 629.2
Non-U.S. Plans    
Information for pension plans with an ABO in excess of plan assets:    
Fair value of plan assets 92.0 86.1
Accumulated benefit obligation 191.2 196.7
Projected benefit obligation $ 214.0 $ 223.6