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Pension Plans - Reconciliations of Plan Benefit Obligation, Fair Value of Plan Assets and Funded Status of Pension Plans (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit obligation at January 1   $ 258.2 $ 411.6  
Interest cost   11.2 7.5 $ 6.7
Settlement gain   (29.3) (5.9)  
Actuarial gains   (5.4) (102.7)  
Exchange difference   12.8 (37.0)  
Benefits paid   (13.5) (15.3)  
Benefit obligation at December 31 $ 411.6 234.0 258.2 411.6
Change in plan assets        
Fair value of plan assets at January 1   280.7 423.4  
Actual return on assets   19.4 (81.6)  
Exchange difference   14.6 (40.4)  
Contributions from employer   2.3 0.4  
Benefits paid   (13.5) (15.2)  
Settlement loss   (29.3) (5.9)  
Fair value of plan assets at December 31 423.4 274.2 280.7 423.4
Funded status        
Net benefit surplus / (obligation)   40.2 22.5  
U.K.        
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit obligation at January 1   225.6 362.9  
Interest cost   11.0 6.2 5.6
Settlement gain   0.0 0.0  
Actuarial gains   (2.9) (93.7)  
Exchange difference   12.8 (37.0)  
Benefits paid (12.7) (12.6) (12.8)  
Benefit obligation at December 31 362.9 233.9 225.6 362.9
Change in plan assets        
Fair value of plan assets at January 1   252.6 376.6  
Actual return on assets   19.4 (71.2)  
Exchange difference   14.6 (40.4)  
Contributions from employer   0.2 0.4  
Benefits paid   (12.6) (12.8)  
Settlement loss   0.0 0.0  
Fair value of plan assets at December 31 376.6 274.2 252.6 376.6
Funded status        
Net benefit surplus / (obligation)   40.3 27.0  
U.S. / other        
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]        
Benefit obligation at January 1   32.6 48.7  
Interest cost   0.2 1.3 1.1
Settlement gain   (29.3) (5.9)  
Actuarial gains   (2.5) (9.0)  
Exchange difference   0.0 0.0  
Benefits paid   (0.9) (2.5)  
Benefit obligation at December 31 48.7 0.1 32.6 48.7
Change in plan assets        
Fair value of plan assets at January 1   28.1 46.8  
Actual return on assets   0.0 (10.4)  
Exchange difference   0.0 0.0  
Contributions from employer   2.1 0.0  
Benefits paid   (0.9) (2.4)  
Settlement loss   (29.3) (5.9)  
Fair value of plan assets at December 31 $ 46.8 0.0 28.1 $ 46.8
Funded status        
Net benefit surplus / (obligation)   $ (0.1) $ (4.5)