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Benefit Plans
 3 Months Ended
Mar. 31, 2015
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 March 31 were as follows ($ in millions):

 
Pension benefits
 
Other retirement benefits
 
Total
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Service cost
$
2.7

 
$
2.5

 
$
0.1

 
$
0.1

 
$
2.8

 
$
2.6

Interest cost
3.9

 
4.2

 
0.1

 
0.1

 
4.0

 
4.3

Expected return on assets
(5.7
)
 
(4.8
)
 
—

 
—

 
(5.7
)
 
(4.8
)
Amortization of prior service credit
(0.3
)
 
(0.3
)
 
—

 
—

 
(0.3
)
 
(0.3
)
Recognized actuarial losses (gains)
1.6

 
1.2

 
(0.3
)
 
(0.4
)
 
1.3

 
0.8

Net periodic benefit cost
$
2.2

 
$
2.8

 
$
(0.1
)
 
$
(0.2
)
 
$
2.1

 
$
2.6


 
Pension benefits
 
Other retirement benefits
 
Total
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
U.S. plans
$
1.5

 
$
2.1

 
$
(0.1
)
 
$
(0.2
)
 
$
1.4

 
$
1.9

International plans
0.7

 
0.7

 
—

 
—

 
0.7

 
0.7

Net periodic benefit cost
$
2.2

 
$
2.8

 
$
(0.1
)
 
$
(0.2
)
 
$
2.1

 
$
2.6