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Retirement Benefit Plans - Schedule of Net Periodic Benefit Cost for the Defined Benefit Pension Plans (Details) - Pension Plan - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Components of net periodic benefit cost:        
Service cost $ 0.6 $ 0.6 $ 1.9 $ 1.9
Interest cost 7.2 6.9 21.4 20.5
Expected return on plan assets (4.4) (4.3) (13.1) (12.9)
Amortization of prior service cost 0.1 0.0 0.2 0.2
Net periodic benefit cost 3.5 3.2 10.4 9.7
U.S. Plans        
Components of net periodic benefit cost:        
Service cost 0.2 0.1 0.5 0.5
Interest cost 4.3 4.3 13.0 12.8
Expected return on plan assets (2.1) (1.9) (6.2) (5.7)
Amortization of prior service cost 0.0 0.0 0.0 0.1
Net periodic benefit cost 2.4 2.5 7.3 7.7
International Plans        
Components of net periodic benefit cost:        
Service cost 0.4 0.5 1.4 1.4
Interest cost 2.9 2.6 8.4 7.7
Expected return on plan assets (2.3) (2.4) (6.9) (7.2)
Amortization of prior service cost 0.1 0.0 0.2 0.1
Net periodic benefit cost $ 1.1 $ 0.7 $ 3.1 $ 2.0