Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2022

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)	2022		2021		2022		2021		2022		2021
Service cost	$	0.3	$	0.1	$	—	$	—	$	0.3	$	0.1
Interest cost	0.5		1.6		0.1		—		0.6		1.6
Expected return on assets	(0.8)		(2.9)		—		—		(0.8)		(2.9)
Amortization of prior service credit	—		—		—		(0.1)		—		(0.1)
Recognized actuarial losses (gains)	0.3		0.5		(0.4)		(0.3)		(0.1)		0.2
Settlements	49.6		—		—		—		49.6		—
Net periodic benefit cost	$	49.9	$	(0.7)	$	(0.3)	$	(0.4)	$	49.6	$	(1.1)

	Pension benefits				Other retirement benefits				Total
($ in millions)	2022		2021		2022		2021		2022		2021
U.S. plans	$	49.6	$	(0.9)	$	(0.3)	$	(0.4)	$	49.3	$	(1.3)
International plans	0.3		0.2		—		—		0.3		0.2
Net periodic benefit cost	$	49.9	$	(0.7)	$	(0.3)	$	(0.4)	$	49.6	$	(1.1)

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)	2022		2021		2022		2021		2022		2021
Service cost	$	1.0	$	0.9	$	—	$	—	$	1.0	$	0.9
Interest cost	3.7		4.5		0.1		0.1		3.8		4.6
Expected return on assets	(5.4)		(9.0)		—		—		(5.4)		(9.0)
Amortization of prior service credit	—		0.1		—		(0.3)		—		(0.2)
Recognized actuarial losses (gains)	1.0		1.5		(1.1)		(1.2)		(0.1)		0.3
Settlements	50.8		0.7		—		—		50.8		0.7
Net periodic benefit cost	$	51.1	$	(1.3)	$	(1.0)	$	(1.4)	$	50.1	$	(2.7)

	Pension benefits				Other retirement benefits				Total
($ in millions)	2022		2021		2022		2021		2022		2021
U.S. plans	$	50.3	$	(2.4)	$	(1.0)	$	(1.4)	$	49.3	$	(3.8)
International plans	0.8		1.1		—		—		0.8		1.1
Net periodic benefit cost	$	51.1	$	(1.3)	$	(1.0)	$	(1.4)	$	50.1	$	(2.7)