Benefit Plans (Tables)

6 Months Ended

Jun. 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 June 30 were as follows:

	Pension benefits				Other retirement benefits				Total
($ in millions)	2023		2022		2023		2022		2023		2022
Service cost	$	0.3	$	0.3	$	—	$	—	$	0.3	$	0.3
Interest cost	0.6		1.6		—		—		0.6		1.6
Expected return on assets	(0.3)		(2.4)		—		—		(0.3)		(2.4)
Recognized actuarial losses (gains)	0.2		0.3		(0.6)		(0.3)		(0.4)		—
Settlements	—		0.6		—		—		—		0.6
Net periodic benefit cost	$	0.8	$	0.4	$	(0.6)	$	(0.3)	$	0.2	$	0.1

	Pension benefits				Other retirement benefits				Total
($ in millions)	2023		2022		2023		2022		2023		2022
U.S. plans	$	0.2	$	0.3	$	(0.6)	$	(0.3)	$	(0.4)	$	—
International plans	0.6		0.1		—		—		0.6		0.1
Net periodic benefit cost	$	0.8	$	0.4	$	(0.6)	$	(0.3)	$	0.2	$	0.1

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

	Pension benefits				Other retirement benefits				Total
($ in millions)	2023		2022		2023		2022		2023		2022
Service cost	$	0.6	$	0.7	$	—	$	—	$	0.6	$	0.7
Interest cost	1.2		3.2		0.1		—		1.3		3.2
Expected return on assets	(0.6)		(4.6)		—		—		(0.6)		(4.6)
Recognized actuarial losses (gains)	0.3		0.7		(1.1)		(0.7)		(0.8)		—
Settlements	—		1.2		—		—		—		1.2
Net periodic benefit cost	$	1.5	$	1.2	$	(1.0)	$	(0.7)	$	0.5	$	0.5

	Pension benefits				Other retirement benefits				Total
($ in millions)	2023		2022		2023		2022		2023		2022
U.S. plans	$	0.3	$	0.7	$	(1.0)	$	(0.7)	$	(0.7)	$	—
International plans	1.2		0.5		—		—		1.2		0.5
Net periodic benefit cost	$	1.5	$	1.2	$	(1.0)	$	(0.7)	$	0.5	$	0.5