Benefit Plans

6 Months Ended

Jun. 30, 2022

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

Benefit Plans

Benefit Plans

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)	2022		2021		2022		2021		2022		2021
Service cost	$	0.3	$	0.4	$	—	$	—	$	0.3	$	0.4
Interest cost	1.6		1.5		—		—		1.6		1.5
Expected return on assets	(2.4)		(3.0)		—		—		(2.4)		(3.0)
Amortization of prior service credit	—		0.1		—		(0.1)		—		—
Recognized actuarial losses (gains)	0.3		0.5		(0.3)		(0.4)		—		0.1
Settlements	0.6		0.1		—		—		0.6		0.1
Net periodic benefit cost	$	0.4	$	(0.4)	$	(0.3)	$	(0.5)	$	0.1	$	(0.9)

	Pension benefits				Other retirement benefits				Total
($ in millions)	2022		2021		2022		2021		2022		2021
U.S. plans	$	0.3	$	(1.0)	$	(0.3)	$	(0.5)	$	—	$	(1.5)
International plans	0.1		0.6		—		—		0.1		0.6
Net periodic benefit cost	$	0.4	$	(0.4)	$	(0.3)	$	(0.5)	$	0.1	$	(0.9)

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)	2022		2021		2022		2021		2022		2021
Service cost	$	0.7	$	0.8	$	—	$	—	$	0.7	$	0.8
Interest cost	3.2		2.9		—		0.1		3.2		3.0
Expected return on assets	(4.6)		(6.1)		—		—		(4.6)		(6.1)
Amortization of prior service credit	—		0.1		—		(0.2)		—		(0.1)
Recognized actuarial losses (gains)	0.7		1.0		(0.7)		(0.8)		—		0.2
Settlements	1.2		0.7		—		—		1.2		0.7
Net periodic benefit cost	$	1.2	$	(0.6)	$	(0.7)	$	(0.9)	$	0.5	$	(1.5)

	Pension benefits				Other retirement benefits				Total
($ in millions)	2022		2021		2022		2021		2022		2021
U.S. plans	$	0.7	$	(1.6)	$	(0.7)	$	(0.9)	$	—	$	(2.5)
International plans	0.5		1.0		—		—		0.5		1.0
Net periodic benefit cost	$	1.2	$	(0.6)	$	(0.7)	$	(0.9)	$	0.5	$	(1.5)

During the three and six months ended June 30, 2022, we recorded a $0.6 million and $1.2 million pension settlement charge, respectively, within other nonoperating (income) expense, as we determined that normal-course lump-sum payments for our U.S. qualified defined benefit pension plan exceeded the threshold for settlement accounting under U.S. GAAP for the year.During the three and six months ended June 30, 2021, we recorded a $0.1 million and $0.7 million pension settlement charge, respectively, within other nonoperating (income) expense, as we determined that normal-course lump-sum payments for our U.S. qualified defined benefit pension plan exceeded the threshold for settlement accounting under U.S. GAAP for the year.