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Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Components of net periodic benefit cost

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
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Service cost
$
2.5

 
$
2.3

 
$
0.4

 
$
0.3

 
$
2.9

 
$
2.6

Interest cost
3.7

 
3.9

 
0.2

 
0.3

 
3.9

 
4.2

Expected return on assets
(4.3
)
 
(4.1
)
 
—

 
—

 
(4.3
)
 
(4.1
)
Amortization of prior service credit
(0.4
)
 
(0.4
)
 
—

 
—

 
(0.4
)
 
(0.4
)
Recognized actuarial losses
2.4

 
2.1

 
—

 
—

 
2.4

 
2.1

Net periodic benefit cost
$
3.9

 
$
3.8

 
$
0.6

 
$
0.6

 
$
4.5

 
$
4.4


 
Pension benefits
 
Other retirement benefits
 
Total
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
U.S. plans
$
3.1

 
$
3.2

 
$
0.6

 
$
0.6

 
$
3.7

 
$
3.8

International plans
0.8

 
0.6

 
—

 
—

 
0.8

 
0.6

Net periodic benefit cost
$
3.9

 
$
3.8

 
$
0.6

 
$
0.6

 
$
4.5

 
$
4.4