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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
A summary of changes in property, plant and equipment follows (in millions):
 
December 31,
2016
 
Additions / (Depreciation)
 
Retirements
 
December 31,
2017
Land
$
1.2

 
$
—

 
$
—

 
$
1.2

Leasehold improvements
3.0

 
0.2

 
—

 
3.2

Machinery and equipment
1.7

 
0.1

 
(0.5
)
 
1.3

Other
0.9

 
0.2

 
—

 
1.1

Property, plant and equipment, gross
6.8

 
0.5

 
(0.5
)
 
6.8

Accumulated depreciation
(0.8
)
 
(1.4
)
 
0.3

 
(1.9
)
Property, plant and equipment, net
$
6.0

 
$
(0.9
)
 
$
(0.2
)
 
$
4.9
Assets and Property Sold [Table Text Block]
The Company sold assets and property in 2017 and 2016 related to its operations and the American Centrifuge project that were no longer needed (in millions):
 
Year Ended December 31,
 
2017
 
2016
Sales of assets and property, net of auction fees and other costs
$
4.8

 
$
1.2

Less: net carrying value
(0.2
)
 
—

Gain on sales of assets
$
4.6

 
$
1.2

 
 
 
 
Cash proceeds received
$
4.7

 
$
1.5