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Inventories (Tables)
 3 Months Ended
Mar. 31, 2019
Inventory, Net [Abstract]  
Schedule of Inventories
Components of inventories are as follows (in millions):
 
March 31, 2019
 
December 31, 2018
 
Current
Assets
 
Current
Liabilities
(a)
 
Inventories, Net
 
Current
Assets
 
Current
Liabilities
(a)
 
Inventories, Net
Separative work units
$
9.7

 
$
4.2

 
$
5.5

 
$
20.1

 
$
3.6

 
$
16.5

Uranium
65.4

 
60.0

 
5.4

 
109.6

 
99.4

 
10.2

Total
$
75.1

 
$
64.2

 
$
10.9

 
$
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.