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Retirement Benefit Plans (Details) - Pension Plan - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Components of net periodic benefit cost:        
Service cost $ 0.6 $ 0.7 $ 1.2 $ 1.3
Interest cost 7.0 7.2 14.0 14.2
Expected return on plan assets (4.7) (4.4) (9.4) (8.7)
Amortization of prior service cost 0.1 0.0 0.1 0.1
Net periodic benefit cost 3.0 3.5 5.9 6.9
U.S. Plans        
Components of net periodic benefit cost:        
Service cost 0.2 0.1 0.3 0.3
Interest cost 4.1 4.4 8.2 8.7
Expected return on plan assets (2.3) (2.0) (4.6) (4.1)
Amortization of prior service cost 0.0 0.0 0.0 0.0
Net periodic benefit cost 2.0 2.5 3.9 4.9
International Plans        
Components of net periodic benefit cost:        
Service cost 0.4 0.6 0.9 1.0
Interest cost 2.9 2.8 5.8 5.5
Expected return on plan assets (2.4) (2.4) (4.8) (4.6)
Amortization of prior service cost 0.1 0.0 0.1 0.1
Net periodic benefit cost $ 1.0 $ 1.0 $ 2.0 $ 2.0