Retirement Benefit Plans - Components of Net Periodic Benefit Cost (Details) - Pension Plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
United States
Components of net periodic benefit cost:
Service cost	$ 6.9	$ 9.5	$ 10.7
Interest cost	17.7	17.6	21.0
Expected return on plan assets	(18.9)	(23.2)	(25.3)
Amortization of prior service cost	1.2	1.2	1.6
Recognition of net actuarial losses (gains)	22.6	13.9	(3.9)
Curtailment losses	0.0	0.0	0.9
Net periodic benefit cost (credit)	29.5	19.0	5.0
International Plans
Components of net periodic benefit cost:
Service cost	1.6	2.0	1.8
Interest cost	5.7	4.4	5.5
Expected return on plan assets	(9.3)	(10.2)	(8.7)
Amortization of prior service cost	0.1	0.2	0.2
Recognition of net actuarial losses (gains)	(6.6)	(9.5)	20.1
Curtailment losses	0.0	0.0	0.0
Net periodic benefit cost (credit)	$ (8.5)	$ (13.1)	$ 18.9