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Property, Plant and Equipment Property, Plant and Equipment
 9 Months Ended
Sep. 30, 2013
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment Disclosure
7. PROPERTY, PLANT AND EQUIPMENT

A summary of changes in property, plant and equipment follows (in millions):
 
December 31,
2012
 
Capital Expenditures (Depreciation)
 
Transfers and Retirements
 
Ceasing of Enrichment at Paducah
 
September 30,
2013
Construction work in progress
$
2.7

 
$
—

 
$
(0.6
)
 
$
(1.7
)
 
$
0.4

Leasehold improvements
183.7

 
—

 
(42.3
)
 
—

 
141.4

Machinery and equipment
181.7

 
—

 
(15.0
)
 
—

 
166.7

 
368.1

 
—

 
(57.9
)
 
(1.7
)
 
308.5

Accumulated depreciation and amortization
(317.1
)
 
(16.2
)
 
55.4

 
(17.6
)
 
(295.5
)
 
$
51.0

 
$
(16.2
)
 
$
(2.5
)
 
$
(19.3
)
 
$
13.0




As noted in Note 3, USEC incurred a charge to cost of sales of $19.3 million in the nine months ended September 30, 2013 in connection with the ceasing of enrichment at the Paducah GDP and the related retirements of property, plant and equipment used in the enrichment process.