Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2025

Entity Information [Line Items]

Schedule of Net Periodic Benefit Cost / (Income)

The following table presents the net periodic benefit cost of the Pension Plans for the three and six months ended June 30, 2025 and 2024:

	Three months ended				Six months ended
	June 30,				June 30,
$ in millions	2025		2024		2025		2024
Service cost	$	0.5	$	0.6	$	1.1	$	1.2
Interest cost	3.7		3.7		7.3		7.4
Expected return on plan assets	(4.0)		(3.7)		(7.9)		(7.4)
Amortization of unrecognized:
Prior service cost	0.3		0.2		0.5		0.5
Actuarial loss	0.8		0.6		1.6		1.1
Net periodic benefit cost	$	1.3	$	1.4	$	2.6	$	2.8