Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2026

Entity Information [Line Items]

Schedule of Net Periodic Benefit Cost / (Income)


												Three months ended
												March 31,
$ in millions																		2026						2025
Service cost																		$	0.5					$	0.6
Interest cost																		3.2						3.6
Expected return on plan assets																		(3.8)						(3.9)
Amortization of unrecognized:
Prior service cost																		0.2						0.2
Actuarial loss																		1.1						1.3
Net periodic benefit cost																		$	1.2					$	1.8