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Property, Plant and Equipment Property, Plant and Equipment (Tables)
 9 Months Ended
Sep. 30, 2013
Property, Plant and Equipment [Abstract]  
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