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Comprehensive Income (Tables)
6 Months Ended
Jun. 30, 2011
Comprehensive Income [Abstract]  
Comprehensive Income
Comprehensive income (loss) was as follows:

   
Three Months Ended
  
Six Months Ended
 
   
June 30,
  
June 30,
 
($ in millions)
 
2011
  
2010
  
2011
  
2010
 
Net income
 $20.1  $21.7  $39.7  $41.6 
Other comprehensive income (loss), net of tax:
                
Foreign currency translation adjustments
  10.2   (28.0)  31.5   (46.6)
Defined benefit pension and other postretirement plans
  0.6   0.8   0.5   2.0 
Unrealized gains (losses) on derivatives:
                
Unrealized gains arising during the period
  0.1   0.4   0.1   0.9 
Losses included in net income
  (0.6)  (0.8)  (1.4)  (1.6)
Net unrealized losses on derivatives
  (0.5)  (0.4)  (1.3)  (0.7)
Other comprehensive income (loss), net of tax
  10.3   (27.6)  30.7   (45.3)
Comprehensive income (loss)
 $30.4  $(5.9) $70.4  $(3.7)