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Accounts Receivable (Tables)
3 Months Ended
Mar. 31, 2017
Accounts Receivable, Net, Current [Abstract]  
Schedule of Accounts Receivable
 
March 31,
2017
 
December 31,
2016
 
(in millions)
Utility customers and other
$
1.1

 
$
15.3

Contract services, primarily DOE
4.7

 
4.6

Accounts receivable
$
5.8

 
$
19.9