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Property, Plant and Equipment
12 Months Ended
Dec. 31, 2012
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
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)
2012

2011

Land
 
$
9.0

$
8.9

Buildings and improvements
5-50
310.9

284.1

Machinery and equipment
10-15
607.1

565.7

Molds and dies
4-7
90.1

85.8

Computer hardware and software
3-10
102.5

76.2

Construction in progress
 
155.2

116.1

 
 
$
1,274.8

$
1,136.8



Depreciation expense for the years ended December 31, 2012, 2011 and 2010 was $72.8 million, $71.1 million and $68.8 million, respectively.

Capitalized leases included in 'buildings and improvements' were $2.4 million and $2.3 million at December 31, 2012 and 2011, respectively. Capitalized leases included in 'machinery and equipment' were $1.8 million and $1.9 million at December 31, 2012 and 2011, respectively. Accumulated depreciation on all property, plant and equipment accounted for as capitalized leases was $1.6 million and $1.1 million at December 31, 2012 and 2011, respectively. At December 31, 2012, future minimum payments under capital leases were $0.3 million in 2013, $0.2 million in 2014, and $0.2 million in 2015.

Under the terms of our 2011 construction and development agreement, the majority of costs required to construct our new corporate office and research building was incurred by our counterparty during the construction period and paid by us at settlement in February 2013. As of December 31, 2012, construction and development costs in the amount of $35.3 million were accrued to property, plant and equipment. See Note 11, Debt, 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, 2012, 2011 and 2010 was $1.9 million, $1.1 million and $0.9 million, respectively.