Benefit Plans

3 Months Ended

Mar. 31, 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 March 31 were as follows:

	Pension benefits				Other retirement benefits				Total
($ in millions)	2022		2021		2022		2021		2022		2021
Service cost	$	0.4	$	0.4	$	—	$	—	$	0.4	$	0.4
Interest cost	1.6		1.4		—		0.1		1.6		1.5
Expected return on assets	(2.2)		(3.1)		—		—		(2.2)		(3.1)
Amortization of prior service credit	—		—		—		(0.1)		—		(0.1)
Recognized actuarial losses (gains)	0.4		0.5		(0.4)		(0.4)		—		0.1
Settlements	0.6		0.6		—		—		0.6		0.6
Net periodic benefit cost	$	0.8	$	(0.2)	$	(0.4)	$	(0.4)	$	0.4	$	(0.6)

	Pension benefits				Other retirement benefits				Total
($ in millions)	2022		2021		2022		2021		2022		2021
U.S. plans	$	0.4	$	(0.6)	$	(0.4)	$	(0.4)	$	—	$	(1.0)
International plans	0.4		0.4		—		—		0.4		0.4
Net periodic benefit cost	$	0.8	$	(0.2)	$	(0.4)	$	(0.4)	$	0.4	$	(0.6)

During the three months ended March 31, 2022 and 2021, we recorded a pension settlement charge of $0.6 million and $0.6 million, 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.