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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
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at January 1 $ 234.0 $ 258.2  
Interest cost 10.2 11.2 $ 7.5
Settlement gain 0.0 (29.3)  
Actuarial gains (20.8) (5.4)  
Exchange difference (3.0) 12.8  
Benefits paid (15.3) (13.5)  
Benefit obligation at December 31 205.1 234.0 258.2
Change in plan assets      
Fair value of plan assets at January 1 274.2 280.7  
Actual (loss) / return on assets (1.0) 19.4  
Exchange difference (3.6) 14.6  
Contributions from employer 0.0 2.3  
Benefits paid (15.3) (13.5)  
Settlement loss 0.0 (29.3)  
Fair value of plan assets at December 31 254.3 274.2 280.7
Funded status      
Net benefit surplus / (obligation) 49.2 40.2  
U.K.      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at January 1 233.9 225.6  
Interest cost 10.2 11.0 6.2
Settlement gain 0.0 0.0  
Actuarial gains (20.8) (2.9)  
Exchange difference (3.0) 12.8  
Benefits paid (15.3) (12.6)  
Benefit obligation at December 31 205.0 233.9 225.6
Change in plan assets      
Fair value of plan assets at January 1 274.2 252.6  
Actual (loss) / return on assets (1.0) 19.4  
Exchange difference (3.6) 14.6  
Contributions from employer 0.0 0.2  
Benefits paid (15.3) (12.6)  
Settlement loss 0.0 0.0  
Fair value of plan assets at December 31 254.3 274.2 252.6
Funded status      
Net benefit surplus / (obligation) 49.3 40.3  
U.S. / other      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at January 1 0.1 32.6  
Interest cost 0.0 0.2 1.3
Settlement gain 0.0 (29.3)  
Actuarial gains 0.0 (2.5)  
Exchange difference 0.0 0.0  
Benefits paid 0.0 (0.9)  
Benefit obligation at December 31 0.1 0.1 32.6
Change in plan assets      
Fair value of plan assets at January 1 0.0 28.1  
Actual (loss) / return on assets 0.0 0.0  
Exchange difference 0.0 0.0  
Contributions from employer 0.0 2.1  
Benefits paid 0.0 (0.9)  
Settlement loss 0.0 (29.3)  
Fair value of plan assets at December 31 0.0 0.0 $ 28.1
Funded status      
Net benefit surplus / (obligation) $ (0.1) $ (0.1)