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Property plant and equipment (Tables)
12 Months Ended
Dec. 31, 2011
Property plant and equipment [Abstract]  
Summary of gross property, plant and equipment
A summary of gross property, plant and equipment at December 31 is presented in the following table:

($ in millions)
 
Expected useful lives (years)
  
2011
  
2010
 
Land
    $8.9  $9.0 
Buildings and improvements
  5-50   284.1   276.4 
Machinery and equipment
  10-15   565.7   568.7 
Molds and dies
  4-7   85.8   84.8 
Computer hardware and software
  3-10   76.2   68.2 
Construction in progress
      116.1   70.1 
       $1,136.8  $1,077.2