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

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

 
$
(0.2
)
 
$

 
$
(0.2
)
Impairments and asset write-offs

 
0.3

 

 
0.4

Other restructuring charges

 
0.2

 

 
0.5

Total restructuring and related charges

 
0.3

 

 
0.7

Impairment charge

 
3.4

 

 
3.4

Development income
(0.5
)
 
(3.8
)
 
(0.8
)
 
(3.8
)
Acquisition-related contingencies
0.2

 
0.2

 
0.2

 
0.4

Foreign exchange and other
(0.5
)
 
0.4

 

 
(0.4
)
Total restructuring and other items
$
(0.8
)
 
$
0.5

 
$
(0.6
)
 
$
0.3

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
(2.6
)
Balance, June 30, 2013
$
0.2