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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2017
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
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



Depreciations expense was $1.4 million and $0.6 million for the years ended December 31, 2017 and 2016, respectively.

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

 
 
 
 


Cash proceeds for the years ended December 31, 2017 and 2016 include $0.2 million and $0.1 million, respectively, which were included in Accounts Receivable as of December 31 of the prior year.