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Postretirement and Other Benefits - Funded Status (Details) - Pension Benefits - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
U.S.      
Change in Projected Benefit Obligation, or PBO:      
PBO at beginning of year $ 125.1 $ 119.9  
Acquisition 1.9 0.0  
Service cost 0.0 0.0 $ 0.0
Interest cost 2.8 3.7 4.6
Actuarial (gain) loss (2.6) 9.7  
Participant contributions 0.0 0.0  
Gross benefits paid (8.8) (8.2)  
Currency translation effect 0.0 0.0  
PBO at end of year 118.4 125.1 119.9
Change in Plan Assets:      
Fair value of plan assets at beginning of year 134.4 125.8  
Acquisition 0.0 0.0  
Actual return on plan assets (0.9) 16.8  
Employer contributions 0.0  
Participant contributions 0.0 0.0  
Gross benefits paid (8.8) (8.2)  
Currency translation effect 0.0 0.0  
Fair value of plan assets at end of year 124.7 134.4 125.8
Funded status at end of year 6.3 9.3  
France      
Change in Projected Benefit Obligation, or PBO:      
PBO at beginning of year 35.8 31.9  
Acquisition 5.4 0.0  
Service cost 1.6 1.3 1.0
Interest cost 0.1 0.2 0.4
Actuarial (gain) loss (2.1) 0.6  
Participant contributions 0.8 0.5  
Gross benefits paid (2.7) (1.7)  
Currency translation effect (2.9) 3.0  
PBO at end of year 36.0 35.8 31.9
Change in Plan Assets:      
Fair value of plan assets at beginning of year 0.8 1.1  
Acquisition 0.0 0.0  
Actual return on plan assets 0.1 0.0  
Employer contributions 1.8 1.2  
Participant contributions 0.1 0.0  
Gross benefits paid (2.2) (1.6)  
Currency translation effect (0.1) 0.1  
Fair value of plan assets at end of year 0.5 0.8 1.1
Funded status at end of year (35.5) (35.0)  
U.K.      
Change in Projected Benefit Obligation, or PBO:      
PBO at beginning of year 0.0 0.0  
Acquisition 200.1 0.0  
Service cost 0.0 0.0 0.0
Interest cost 2.5 0.0 0.0
Actuarial (gain) loss 4.3 0.0  
Participant contributions 0.0 0.0  
Gross benefits paid (10.7) 0.0  
Currency translation effect (3.9) 0.0  
PBO at end of year 192.3 0.0 0.0
Change in Plan Assets:      
Fair value of plan assets at beginning of year 0.0 0.0  
Acquisition 211.4 0.0  
Actual return on plan assets 10.9 0.0  
Employer contributions 2.9 0.0  
Participant contributions 0.0 0.0  
Gross benefits paid (10.8) 0.0  
Currency translation effect (4.3) 0.0  
Fair value of plan assets at end of year 210.1 0.0 $ 0.0
Funded status at end of year $ 17.8 $ 0.0