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Retirement Benefit Plans - Schedule of Net Periodic Benefit Cost Information and the Related Assumptions Used to Measure the Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
United States      
Components of net periodic benefit cost:      
Service cost $ 0.7 $ 0.8 $ 6.9
Interest cost 17.1 17.9 17.7
Expected return on plan assets (7.6) (8.5) (18.9)
Amortization of prior service cost 0.1 0.2 1.2
Recognition of net actuarial (gains) losses (1.3) 9.2 22.6
Curtailment gain 0.0 0.0 0.0
Net periodic benefit cost (credit) 9.0 19.6 29.5
International Plans      
Components of net periodic benefit cost:      
Service cost 1.9 1.6 1.6
Interest cost 10.2 10.4 5.7
Expected return on plan assets (9.6) (10.4) (9.3)
Amortization of prior service cost 0.2 0.2 0.1
Recognition of net actuarial (gains) losses 0.6 12.4 (6.6)
Curtailment gain (0.1) 0.0 0.0
Net periodic benefit cost (credit) $ 3.2 $ 14.2 $ (8.5)