The components of net periodic benefit cost in respect of these defined benefit plans are as follows:


	Retirement Plans
$ in millions	2021	2020	2019
Service cost	0.6	2.4	1.1
Interest cost	8.9	9.2	13.4
Expected return on plan assets	(16.8)	(23.7)	(22.1)
Amortization of prior service cost/(credit)	0.2	0.2	0.3
Amortization of net actuarial (gain)/loss	2.7	3.6	2.9
Settlement	4.4	8.0	(0.2)
Curtailment (gain)/loss	(0.3)	—	0.4
Net periodic benefit cost/(credit)	(0.3)	(0.3)	(4.2)

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