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


	Retirement Plans
$ in millions	2020	2019	2018
Service cost	2.4	1.1	3.8
Interest cost	9.2	13.4	12.6
Expected return on plan assets	(23.7)	(22.1)	(22.0)
Amortization of prior service cost/(credit)	0.2	0.3	0.2
Amortization of net actuarial (gain)/loss	3.6	2.9	2.1
Settlement	8.0	(0.2)	3.1
Curtailment (gain)/loss	—	0.4	—
Net periodic benefit cost/(credit)	(0.3)	(4.2)	(0.2)

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