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Restructuring and Other Items (Tables)
 9 Months Ended
Sep. 30, 2013
Restructuring and Other Items [Abstract]  
Schedule of restructuring and other items
Restructuring and other items consisted of:

 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
($ in millions)
2013
 
2012
 
2013
 
2012
Restructuring and related charges (reversals):
 
 
 
 
 
 
 
Severance and post-employment benefits
$
—

 
$
(1.1
)
 
$
—

 
$
(1.3
)
Impairments and asset write-offs
—

 
2.0

 
—

 
2.4

Other restructuring charges
—

 
0.2

 
—

 
0.7

Total restructuring and related charges
—

 
1.1

 
—

 
1.8

Impairment charge
—

 
—

 
—

 
3.4

Development income
(0.4
)
 
(0.4
)
 
(1.2
)
 
(4.2
)
Acquisition-related contingencies
0.3

 
0.5

 
0.5

 
0.9

Foreign exchange and other
0.2

 
1.0

 
0.2

 
0.6

Total restructuring and other items
$
0.1

 
$
2.2

 
$
(0.5
)
 
$
2.5
Activity related to restructuring obligations
The following table presents activity related to our restructuring obligations:

($ in millions)
Severance
and benefits
Balance, December 31, 2012
$
2.8

Cash payments
(2.7
)
Balance, September 30, 2013
$
0.1