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Inventories (Tables)
 6 Months Ended
Jun. 30, 2019
Inventory, Net [Abstract]  
Schedule of Inventories
Components of inventories are as follows (in millions):
 
June 30, 2019
 
December 31, 2018
 
Current
Assets
 
Current
Liabilities
(a)
 
Inventories, Net
 
Current
Assets
 
Current
Liabilities
(a)
 
Inventories, Net
Separative work units
$
18.4

 
$
0.5

 
$
17.9

 
$
20.1

 
$
3.6

 
$
16.5

Uranium
123.3

 
58.5

 
64.8

 
109.6

 
99.4

 
10.2

Total
$
141.7

 
$
59.0

 
$
82.7

 
$
129.7

 
$
103.0

 
$
26.7



(a)
Inventories owed to customers and suppliers, included in current liabilities, include SWU and uranium inventories owed to fabricators.