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Accounts Receivable (Tables)
6 Months Ended
Jun. 30, 2016
Accounts Receivable, Net, Current [Abstract]  
Schedule of Accounts Receivable
 
June 30,
2016
 
December 31,
2015
 
(in millions)
Utility customers and other
$
46.8

 
$
24.7

Contract services, primarily DOE
4.5

 
1.8

Accounts receivable
$
51.3

 
$
26.5