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Postretirement and Other Benefits - Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Benefits | United States      
Change in PBO:      
PBO at beginning of year $ 339.6 $ 118.4  
Acquisition 0.0 265.3  
Service cost 1.6 0.9 $ 0.0
Interest cost 17.7 9.3 2.8
Actuarial (gain) loss 8.6 (36.8)  
Participant contributions 0.0 0.0  
Plan amendment 0.0 0.0  
Plan settlements 0.0 (0.3)  
Gross benefits paid (25.5) (17.2)  
Currency translation effect 0.0 0.0  
PBO at end of year 342.0 339.6 118.4
Change in Plan Assets:      
Fair value of plan assets at beginning of year 349.2 124.7  
Acquisition 0.0 268.2  
Actual return on plan assets 32.6 (26.9)  
Employer contributions 0.5 0.7  
Participant contributions 0.0 0.0  
Plan settlements 0.0 (0.3)  
Gross benefits paid (25.5) (17.2)  
Currency translation effect 0.0 0.0  
Fair value of plan assets at end of year 356.8 349.2 124.7
Funded status at end of year 14.8 9.6  
Pension Benefits | Non-U.S.      
Change in PBO:      
PBO at beginning of year 189.9 203.1  
Acquisition 0.2 72.6  
Service cost 1.0 0.7 0.3
Interest cost 8.4 4.4 2.5
Actuarial (gain) loss 27.9 (58.1)  
Participant contributions 0.0 0.0  
Plan amendment 0.6 0.0  
Plan settlements (4.8) (0.2)  
Gross benefits paid (13.2) (12.9)  
Currency translation effect 9.5 (19.7)  
PBO at end of year 219.5 189.9 203.1
Change in Plan Assets:      
Fair value of plan assets at beginning of year 174.6 215.7  
Acquisition 0.0 42.3  
Actual return on plan assets 20.4 (53.8)  
Employer contributions 6.8 6.0  
Participant contributions 0.0 0.0  
Plan settlements (4.8) (0.2)  
Gross benefits paid (13.2) (12.9)  
Currency translation effect 9.1 (22.5)  
Fair value of plan assets at end of year 192.9 174.6 215.7
Funded status at end of year (26.6) (15.3)  
Other Postretirement Benefits | United States      
Change in PBO:      
PBO at beginning of year 25.0 1.3  
Acquisition 0.0 26.4  
Service cost 0.2 0.1  
Interest cost 1.2 0.6  
Actuarial (gain) loss 1.1 (1.4)  
Participant contributions 0.1 0.1  
Plan amendment 0.0 0.0  
Plan settlements 0.0 0.0  
Gross benefits paid (4.4) (2.1)  
Currency translation effect 0.0 0.0  
PBO at end of year 23.2 25.0 1.3
Change in Plan Assets:      
Fair value of plan assets at beginning of year 0.0 0.0  
Acquisition 0.0 0.0  
Actual return on plan assets 0.0 0.0  
Employer contributions 4.3 2.0  
Participant contributions 0.1 0.1  
Plan settlements 0.0 0.0  
Gross benefits paid (4.4) (2.1)  
Currency translation effect 0.0 0.0  
Fair value of plan assets at end of year 0.0 0.0 0.0
Funded status at end of year (23.2) (25.0)  
Other Postretirement Benefits | Non-U.S.      
Change in PBO:      
PBO at beginning of year 3.6 0.2  
Acquisition 0.0 3.4  
Service cost 1.2 0.4  
Interest cost 0.1 0.0  
Actuarial (gain) loss 0.2 0.1  
Participant contributions 0.0 0.0  
Plan amendment 0.0 0.1  
Plan settlements 0.0 0.0  
Gross benefits paid (1.4) (0.7)  
Currency translation effect 0.1 0.1  
PBO at end of year 3.8 3.6 0.2
Change in Plan Assets:      
Fair value of plan assets at beginning of year 0.0 0.0  
Acquisition 0.0 0.0  
Actual return on plan assets 0.0 0.0  
Employer contributions 1.4 0.7  
Participant contributions 0.0 0.0  
Plan settlements 0.0 0.0  
Gross benefits paid (1.4) (0.7)  
Currency translation effect 0.0 0.0  
Fair value of plan assets at end of year 0.0 0.0 $ 0.0
Funded status at end of year $ (3.8) $ (3.6)