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Benefit Plans
 9 Months Ended
Sep. 30, 2018
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)
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Service cost
$
2.6

 
$
2.5

 
$
—

 
$
—

 
$
2.6

 
$
2.5

Interest cost
2.3

 
2.4

 
0.1

 
—

 
2.4

 
2.4

Expected return on assets
(3.9
)
 
(3.4
)
 
—

 
—

 
(3.9
)
 
(3.4
)
Amortization of prior service credit
(0.3
)
 
(0.3
)
 
(0.2
)
 
(0.1
)
 
(0.5
)
 
(0.4
)
Recognized actuarial losses (gains)
0.9

 
1.2

 
(0.7
)
 
(0.9
)
 
0.2

 
0.3

Net periodic benefit cost
$
1.6

 
$
2.4

 
$
(0.8
)
 
$
(1.0
)
 
$
0.8

 
$
1.4


 
Pension benefits
 
Other retirement benefits
 
Total
($ in millions)
2018
 
2017
 
2018
 
2017
 
2018
 
2017
U.S. plans
$
1.0

 
$
1.7

 
$
(0.8
)
 
$
(1.0
)
 
$
0.2

 
$
0.7

International plans
0.6

 
0.7

 
—

 
—

 
0.6

 
0.7

Net periodic benefit cost
$
1.6

 
$
2.4

 
$
(0.8
)
 
$
(1.0
)
 
$
0.8

 
$
1.4


The components of net periodic benefit cost for the nine months ended September 30 were as follows ($ in millions):
 
Pension benefits
 
Other retirement benefits
 
Total
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
Service cost
$
8.1

 
$
7.8

 
$
—

 
$
—

 
$
8.1

 
$
7.8

Interest cost
7.0

 
7.3

 
0.2

 
0.2

 
7.2

 
7.5

Expected return on assets
(11.7
)
 
(10.1
)
 
—

 
—

 
(11.7
)
 
(10.1
)
Amortization of prior service credit
(1.1
)
 
(1.0
)
 
(0.5
)
 
(0.5
)
 
(1.6
)
 
(1.5
)
Recognized actuarial losses (gains)
2.8

 
3.6

 
(1.8
)
 
(2.0
)
 
1.0

 
1.6

Net periodic benefit cost
$
5.1

 
$
7.6

 
$
(2.1
)
 
$
(2.3
)
 
$
3.0

 
$
5.3

 
Pension benefits
 
Other retirement benefits
 
Total
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
U.S. plans
$
3.5

 
$
5.5

 
$
(2.1
)
 
$
(2.3
)
 
$
1.4

 
$
3.2

International plans
1.6

 
2.1

 
—

 
—

 
1.6

 
2.1

Net periodic benefit cost
$
5.1

 
$
7.6

 
$
(2.1
)
 
$
(2.3
)
 
$
3.0

 
$
5.3



In March 2017, the FASB issued guidance on the presentation of net periodic pension and postretirement benefit cost (net benefit cost). We adopted this guidance as of January 1, 2018, on a retrospective basis. Please refer to Note 2, New Accounting Standards, for additional information.

During the nine months ended September 30, 2017, we contributed $20.0 million to our U.S. qualified pension plan.

Effective January 1, 2019, except for interest crediting, benefit accruals under our U.S. qualified and non-qualified defined benefit pension plans will cease.