Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2023

Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]

Schedule of Components of Net Periodic Benefit Cost

The components of net periodic benefit cost for the three months ended September 30 were as follows:

	Pension benefits				Other retirement benefits				Total
($ in millions)	2023		2022		2023		2022		2023		2022
Service cost	$	0.2	$	0.3	$	—	$	—	$	0.2	$	0.3
Interest cost	0.6		0.5		0.1		0.1		0.7		0.6
Expected return on assets	(0.4)		(0.8)		—		—		(0.4)		(0.8)
Recognized actuarial losses (gains)	0.2		0.3		(0.5)		(0.4)		(0.3)		(0.1)
Settlements	—		49.6		—		—		—		49.6
Net periodic benefit cost	$	0.6	$	49.9	$	(0.4)	$	(0.3)	$	0.2	$	49.6

	Pension benefits				Other retirement benefits				Total
($ in millions)	2023		2022		2023		2022		2023		2022
U.S. plans	$	—	$	49.6	$	(0.4)	$	(0.3)	$	(0.4)	$	49.3
International plans	0.6		0.3		—		—		0.6		0.3
Net periodic benefit cost	$	0.6	$	49.9	$	(0.4)	$	(0.3)	$	0.2	$	49.6

The components of net periodic benefit cost for the nine months ended September 30 were as follows:

	Pension benefits				Other retirement benefits				Total
($ in millions)	2023		2022		2023		2022		2023		2022
Service cost	$	0.8	$	1.0	$	—	$	—	$	0.8	$	1.0
Interest cost	1.8		3.7		0.2		0.1		2.0		3.8
Expected return on assets	(1.0)		(5.4)		—		—		(1.0)		(5.4)
Recognized actuarial losses (gains)	0.5		1.0		(1.6)		(1.1)		(1.1)		(0.1)
Settlements	—		50.8		—		—		—		50.8
Net periodic benefit cost	$	2.1	$	51.1	$	(1.4)	$	(1.0)	$	0.7	$	50.1

	Pension benefits				Other retirement benefits				Total
($ in millions)	2023		2022		2023		2022		2023		2022
U.S. plans	$	0.3	$	50.3	$	(1.4)	$	(1.0)	$	(1.1)	$	49.3
International plans	1.8		0.8		—		—		1.8		0.8
Net periodic benefit cost	$	2.1	$	51.1	$	(1.4)	$	(1.0)	$	0.7	$	50.1