v3.26.3
Retirement Benefit Plans (Details) - Pension Plan - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Components of net periodic benefit cost:        
Service cost $ 0.6 $ 0.6 $ 1.8 $ 1.9
Interest cost 7.0 7.2 21.0 21.4
Expected return on plan assets (4.8) (4.4) (14.2) (13.1)
Amortization of prior service cost 0.1 0.1 0.2 0.2
Net periodic benefit cost 2.9 3.5 8.8 10.4
U.S. Plans        
Components of net periodic benefit cost:        
Service cost 0.1 0.2 0.4 0.5
Interest cost 4.2 4.3 12.4 13.0
Expected return on plan assets (2.4) (2.1) (7.0) (6.2)
Amortization of prior service cost 0.0 0.0 0.0 0.0
Net periodic benefit cost 1.9 2.4 5.8 7.3
International Plans        
Components of net periodic benefit cost:        
Service cost 0.5 0.4 1.4 1.4
Interest cost 2.8 2.9 8.6 8.4
Expected return on plan assets (2.4) (2.3) (7.2) (6.9)
Amortization of prior service cost 0.1 0.1 0.2 0.2
Net periodic benefit cost $ 1.0 $ 1.1 $ 3.0 $ 3.1