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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2019
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)
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