Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2020

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)	2020		2019		2020		2019		2020		2019
Service cost	$	0.4	$	0.4	$	—	$	—	$	0.4	$	0.4
Interest cost	1.7		1.9		—		0.1		1.7		2.0
Expected return on assets	(2.8)		(3.1)		—		—		(2.8)		(3.1)
Amortization of prior service credit	0.1		0.1		(0.2)		(0.2)		(0.1)		(0.1)
Recognized actuarial losses (gains)	0.4		0.5		(0.6)		(0.7)		(0.2)		(0.2)
Settlements	1.1		2.7		—		—		1.1		2.7
Net periodic benefit cost	$	0.9	$	2.5	$	(0.8)	$	(0.8)	$	0.1	$	1.7

	Pension benefits				Other retirement benefits				Total
($ in millions)	2020		2019		2020		2019		2020		2019
U.S. plans	$	0.5	$	2.0	$	(0.8)	$	(0.8)	$	(0.3)	$	1.2
International plans	0.4		0.5		—		—		0.4		0.5
Net periodic benefit cost	$	0.9	$	2.5	$	(0.8)	$	(0.8)	$	0.1	$	1.7

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)	2020		2019		2020		2019		2020		2019
Service cost	$	1.0	$	1.1	$	—	$	—	$	1.0	$	1.1
Interest cost	5.5		6.8		0.1		0.2		5.6		7.0
Expected return on assets	(8.8)		(8.9)		—		—		(8.8)		(8.9)
Amortization of prior service credit	0.1		0.1		(0.5)		(0.5)		(0.4)		(0.4)
Recognized actuarial losses (gains)	1.4		1.6		(1.4)		(1.8)		—		(0.2)
Settlements	3.4		2.7		—		—		3.4		2.7
Net periodic benefit cost	$	2.6	$	3.4	$	(1.8)	$	(2.1)	$	0.8	$	1.3

	Pension benefits				Other retirement benefits				Total
($ in millions)	2020		2019		2020		2019		2020		2019
U.S. plans	$	1.5	$	1.9	$	(1.8)	$	(2.1)	$	(0.3)	$	(0.2)
International plans	1.1		1.5		—		—		1.1		1.5
Net periodic benefit cost	$	2.6	$	3.4	$	(1.8)	$	(2.1)	$	0.8	$	1.3