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Property plant and equipment
12 Months Ended
Dec. 31, 2011
Property plant and equipment [Abstract]  
Property plant and equipment
Note 9: 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 

Depreciation expense for the years ended December 31, 2011, 2010 and 2009 was $71.1 million, $68.8 million and $63.9 million, respectively.

Capitalized leases included in ‘buildings and improvements’ were $2.3 million and $2.4 million at December 31, 2011 and 2010, respectively. Capitalized leases included in ‘machinery and equipment’ were $1.9 million and $3.6 million at December 31, 2011 and 2010, respectively.  Accumulated depreciation on all property, plant and equipment accounted for as capitalized leases was $1.1 million and $1.1 million at December 31, 2011 and 2010, respectively. At December 31, 2011, future minimum payments under capital leases were $0.4 million in 2012, $0.3 million in 2013, $0.2 million in 2014 and $0.2 million in 2015.

Under the terms of our construction and development agreement, the majority of costs required to construct our new corporate office and research building will be incurred by our counterparty during the construction period and paid by us at settlement. All construction costs incurred during 2011 and 2012, which are not due until settlement, will be accrued to property, plant and equipment and other long-term liabilities until they are paid. As of December 31, 2011, we have accrued $22.4 million of construction and development costs. See Note 16, Commitments and Contingencies, for further discussion of this capital project.

We capitalize interest on borrowings during the active construction period of major capital projects. Capitalized interest is added to the cost of the underlying assets and is amortized over the useful lives of the assets. Capitalized interest for the years ended December 31, 2011, 2010 and 2009 was $1.1 million, $0.9 million and $2.4 million, respectively.