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Benefit Plans (Tables)
6 Months Ended
Jun. 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 June 30 were as follows ($ in millions):

 
Pension benefits
 
Other retirement benefits
 
Total
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Service cost
$
2.7

 
$
2.7

 
$
0.1

 
$
0.2

 
$
2.8

 
$
2.9

Interest cost
2.6

 
3.9

 
0.1

 
0.1

 
2.7

 
4.0

Expected return on assets
(3.2
)
 
(5.7
)
 

 

 
(3.2
)
 
(5.7
)
Amortization of prior service credit
(0.3
)
 
(0.3
)
 

 

 
(0.3
)
 
(0.3
)
Recognized actuarial losses (gains)
1.1

 
1.6

 
(0.3
)
 
(0.4
)
 
0.8

 
1.2

Net periodic benefit cost
$
2.9

 
$
2.2

 
$
(0.1
)
 
$
(0.1
)
 
$
2.8

 
$
2.1


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

 
$
1.6

 
$
(0.1
)
 
$
(0.1
)
 
$
2.2

 
$
1.5

International plans
0.6

 
0.6

 

 

 
0.6

 
0.6

Net periodic benefit cost
$
2.9

 
$
2.2

 
$
(0.1
)
 
$
(0.1
)
 
$
2.8

 
$
2.1



The components of net periodic benefit cost for the six months ended June 30 were as follows ($ in millions):

 
Pension benefits
 
Other retirement benefits
 
Total
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
Service cost
$
5.3

 
$
5.4

 
$
0.3

 
$
0.3

 
$
5.6

 
$
5.7

Interest cost
5.2

 
7.8

 
0.2

 
0.2

 
5.4

 
8.0

Expected return on assets
(6.3
)
 
(11.4
)
 

 

 
(6.3
)
 
(11.4
)
Amortization of prior service credit
(0.7
)
 
(0.6
)
 

 

 
(0.7
)
 
(0.6
)
Recognized actuarial losses (gains)
2.3

 
3.2

 
(0.7
)
 
(0.7
)
 
1.6

 
2.5

Net periodic benefit cost
$
5.8

 
$
4.4

 
$
(0.2
)
 
$
(0.2
)
 
$
5.6

 
$
4.2


 
Pension benefits
 
Other retirement benefits
 
Total
 
2016
 
2015
 
2016
 
2015
 
2016
 
2015
U.S. plans
$
4.6

 
$
3.1

 
$
(0.2
)
 
$
(0.2
)
 
$
4.4

 
$
2.9

International plans
1.2

 
1.3

 

 

 
1.2

 
1.3

Net periodic benefit cost
$
5.8

 
$
4.4

 
$
(0.2
)
 
$
(0.2
)
 
$
5.6

 
$
4.2