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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, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at January 1 $ 205.1 $ 234.0  
Interest cost 11.2 10.2 $ 11.2
Actuarial gains (2.8) (20.8)  
Exchange difference 15.0 (3.0)  
Benefits paid (15.1) (15.3)  
Benefit obligation at December 31 213.4 205.1 234.0
Change in plan assets      
Fair value of plan assets at January 1 254.3 274.2  
Actual return / (loss) on assets 10.4 (1.0)  
Exchange difference 18.6 (3.6)  
Benefits paid (15.1) (15.3)  
Fair value of plan assets at December 31 268.2 254.3 274.2
Funded status      
Net benefit surplus / (obligation) 54.8 49.2  
U.K.      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at January 1 205.0 233.9  
Interest cost 11.2 10.2 11.0
Actuarial gains (2.8) (20.8)  
Exchange difference 15.0 (3.0)  
Benefits paid (15.1) (15.3)  
Benefit obligation at December 31 213.3 205.0 233.9
Change in plan assets      
Fair value of plan assets at January 1 254.3 274.2  
Actual return / (loss) on assets 10.4 (1.0)  
Exchange difference 18.6 (3.6)  
Benefits paid (15.1) (15.3)  
Fair value of plan assets at December 31 268.2 254.3 274.2
Funded status      
Net benefit surplus / (obligation) 54.9 49.3  
Other      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation at January 1 0.1 0.1  
Interest cost 0.0 0.0 0.2
Actuarial gains 0.0 0.0  
Exchange difference 0.0 0.0  
Benefits paid 0.0 0.0  
Benefit obligation at December 31 0.1 0.1 0.1
Change in plan assets      
Fair value of plan assets at January 1 0.0 0.0  
Actual return / (loss) on assets 0.0 0.0  
Exchange difference 0.0 0.0  
Benefits paid 0.0 0.0  
Fair value of plan assets at December 31 0.0 0.0 $ 0.0
Funded status      
Net benefit surplus / (obligation) $ (0.1) $ (0.1)