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Property, Plant and Equipment
6 Months Ended
Jun. 30, 2012
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment, net
 
June 30,
 
December 31,
(millions of dollars)
2012
 
2011
Land and buildings
$
691.4

 
$
687.9

Machinery and equipment
2,141.8

 
2,006.9

Capital leases
2.3

 
2.3

Construction in progress
201.4

 
206.8

Total property, plant and equipment, gross
3,036.9

 
2,903.9

Less: accumulated depreciation
(1,466.7
)
 
(1,343.9
)
Property, plant and equipment, net, excluding tooling
1,570.2

 
1,560.0

Tooling, net of amortization
102.5

 
104.3

Property, plant and equipment, net
$
1,672.7

 
$
1,664.3



As of June 30, 2012 and December 31, 2011, accounts payable of $18.1 million and $48.9 million, respectively, were related to property, plant and equipment purchases.

Interest costs capitalized for the six months ended June 30, 2012 and 2011 were $9.0 million and $6.0 million, respectively.