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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2016
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 ($ in millions):

 
Pension benefits
 
Other retirement benefits
 
Total
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Service cost
$
2.3

 
$
2.5

 
$
0.1

 
$
0.1

 
$
2.4

 
$
2.6

Interest cost
2.7

 
3.4

 
0.1

 
0.1

 
2.8

 
3.5

Expected return on assets
(3.1
)
 
(4.9
)
 
—

 
—

 
(3.1
)
 
(4.9
)
Amortization of prior service credit
(0.3
)
 
(0.3
)
 
—

 
—

 
(0.3
)
 
(0.3
)
Recognized actuarial losses (gains)
1.3

 
1.6

 
(0.3
)
 
(0.4
)
 
1.0

 
1.2

Settlements
—

 
49.0

 
—

 
—

 
—

 
49.0

Net periodic benefit cost
$
2.9

 
$
51.3

 
$
(0.1
)
 
$
(0.2
)
 
$
2.8

 
$
51.1


 
Pension benefits
 
Other retirement benefits
 
Total
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
U.S. plans
$
2.3

 
$
50.7

 
$
(0.1
)
 
$
(0.2
)
 
$
2.2

 
$
50.5

International plans
0.6

 
0.6

 
—

 
—

 
0.6

 
0.6

Net periodic benefit cost
$
2.9

 
$
51.3

 
$
(0.1
)
 
$
(0.2
)
 
$
2.8

 
$
51.1



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
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Service cost
$
7.6

 
$
8.0

 
$
0.4

 
$
0.4

 
$
8.0

 
$
8.4

Interest cost
7.9

 
11.2

 
0.3

 
0.3

 
8.2

 
11.5

Expected return on assets
(9.5
)
 
(16.3
)
 
—

 
—

 
(9.5
)
 
(16.3
)
Amortization of transition obligation
0.1

 
0.1

 
—

 
—

 
0.1

 
0.1

Amortization of prior service credit
(1.0
)
 
(1.0
)
 
—

 
—

 
(1.0
)
 
(1.0
)
Recognized actuarial losses (gains)
3.6

 
4.8

 
(1.0
)
 
(1.1
)
 
2.6

 
3.7

Settlements
—

 
49.0

 
—

 
—

 
—

 
49.0

Net periodic benefit cost
$
8.7

 
$
55.8

 
$
(0.3
)
 
$
(0.4
)
 
$
8.4

 
$
55.4


 
Pension benefits
 
Other retirement benefits
 
Total
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
U.S. plans
$
6.9

 
$
53.8

 
$
(0.3
)
 
$
(0.4
)
 
$
6.6

 
$
53.4

International plans
1.8

 
2.0

 
—

 
—

 
1.8

 
2.0

Net periodic benefit cost
$
8.7

 
$
55.8

 
$
(0.3
)
 
$
(0.4
)
 
$
8.4

 
$
55.4