Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2026

Entity Information [Line Items]

Schedule of Net Periodic Benefit Cost / (Income)


						Three months ended												Nine months ended
						September 30,												September 30,
$ in millions						2026						2025						2026						2025
Service cost						$	0.5					$	0.5					$	1.5					$	1.6
Interest cost						3.2						3.7						9.5						11.0
Expected return on plan assets						(3.8)						(3.9)						(11.3)						(11.8)
Amortization of unrecognized:
Prior service cost						0.2						0.2						0.7						0.7
Actuarial loss						1.1						1.3						3.2						3.8
Net periodic benefit cost						$	1.2					$	1.8					$	3.6					$	5.3