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Benefit Plans
 9 Months Ended
Sep. 30, 2019
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 September 30 were as follows:

 
Pension benefits
 
Other retirement benefits
 
Total
($ in millions)
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Service cost
$
0.4

 
$
2.6

 
$
—

 
$
—

 
$
0.4

 
$
2.6

Interest cost
1.9

 
2.3

 
0.1

 
0.1

 
2.0

 
2.4

Expected return on assets
(3.1
)
 
(3.9
)
 
—

 
—

 
(3.1
)
 
(3.9
)
Amortization of prior service credit
0.1

 
(0.3
)
 
(0.2
)
 
(0.2
)
 
(0.1
)
 
(0.5
)
Recognized actuarial losses (gains)
0.5

 
0.9

 
(0.7
)
 
(0.7
)
 
(0.2
)
 
0.2

Settlements
2.7

 
—

 
—

 
—

 
2.7

 
—

Net periodic benefit cost
$
2.5

 
$
1.6

 
$
(0.8
)
 
$
(0.8
)
 
$
1.7

 
$
0.8


 
Pension benefits
 
Other retirement benefits
 
Total
($ in millions)
2019
 
2018
 
2019
 
2018
 
2019
 
2018
U.S. plans
$
2.0

 
$
1.0

 
$
(0.8
)
 
$
(0.8
)
 
$
1.2

 
$
0.2

International plans
0.5

 
0.6

 
—

 
—

 
0.5

 
0.6

Net periodic benefit cost
$
2.5

 
$
1.6

 
$
(0.8
)
 
$
(0.8
)
 
$
1.7

 
$
0.8


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)
2019
 
2018
 
2019
 
2018
 
2019
 
2018
Service cost
$
1.1

 
$
8.1

 
$
—

 
$
—

 
$
1.1

 
$
8.1

Interest cost
6.8

 
7.0

 
0.2

 
0.2

 
7.0

 
7.2

Expected return on assets
(8.9
)
 
(11.7
)
 
—

 
—

 
(8.9
)
 
(11.7
)
Amortization of prior service credit
0.1

 
(1.1
)
 
(0.5
)
 
(0.5
)
 
(0.4
)
 
(1.6
)
Recognized actuarial losses (gains)
1.6

 
2.8

 
(1.8
)
 
(1.8
)
 
(0.2
)
 
1.0

Settlements
2.7

 
—

 
—

 
—

 
2.7

 
—

Net periodic benefit cost
$
3.4

 
$
5.1

 
$
(2.1
)
 
$
(2.1
)
 
$
1.3

 
$
3.0


 
Pension benefits
 
Other retirement benefits
 
Total
($ in millions)
2019
 
2018
 
2019
 
2018
 
2019
 
2018
U.S. plans
$
1.9

 
$
3.5

 
$
(2.1
)
 
$
(2.1
)
 
$
(0.2
)
 
$
1.4

International plans
1.5

 
1.6

 
—

 
—

 
1.5

 
1.6

Net periodic benefit cost
$
3.4

 
$
5.1

 
$
(2.1
)
 
$
(2.1
)
 
$
1.3

 
$
3.0



During the three and nine months ended September 30, 2019, we recorded a $2.7 million pension settlement charge within other nonoperating expense (income), as we determined that normal-course lump-sum payments for each of our U.S. qualified and non-qualified defined benefit pension plans exceeded the threshold for settlement accounting under U.S. GAAP for the year. Effective January 1, 2019, except for interest crediting, benefit accruals under these defined benefit pension plans ceased.

During the three and nine months ended September 30, 2019, we contributed $2.6 million to our U.S. qualified defined benefit pension plan.