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Pensions (Details) - Narrative
$ in Millions
 12 Months Ended
Mar. 29, 2018
pensionPlan
Dec. 31, 2021
USD ($)
pensionPlan
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]        
Number of defined benefit pension plans acquired | pensionPlan 2      
Number of non-US noncontributory defined benefit pension plans sponsored | pensionPlan   2    
Amount of defined contribution   $ 1.3 $ 1.8 $ 1.9
Defined Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Benefit obligation at end of period   172.9 184.0 169.0
Fair value of plan assets at end of period   172.9 184.0 $ 169.3
Interest (credit) / cost   (0.2) 0.9  
Expected return on plan assets   0.2 (0.9)  
Benefit cost   $ 0.0 $ 0.0