Retirement Benefit Plans (Details) - Pension Plan - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Components of net periodic benefit cost:
Service cost	$ 0.6	$ 0.6
Interest cost	7.0	7.0
Expected return on plan assets	(4.7)	(4.3)
Amortization of prior service cost	0.0	0.1
Net periodic benefit cost	2.9	3.4
U.S. Plans
Components of net periodic benefit cost:
Service cost	0.1	0.2
Interest cost	4.1	4.3
Expected return on plan assets	(2.3)	(2.1)
Amortization of prior service cost	0.0	0.0
Net periodic benefit cost	1.9	2.4
International Plans
Components of net periodic benefit cost:
Service cost	0.5	0.4
Interest cost	2.9	2.7
Expected return on plan assets	(2.4)	(2.2)
Amortization of prior service cost	0.0	0.1
Net periodic benefit cost	$ 1.0	$ 1.0