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Accounts Receivable (Tables)
6 Months Ended
Jun. 30, 2017
Accounts Receivable, Net, Current [Abstract]  
Schedule of Accounts Receivable
 
June 30,
2017
 
December 31,
2016
 
(in millions)
Utility customers and other
$
56.2

 
$
15.3

Contract services, primarily DOE
4.4

 
4.6

Accounts receivable
$
60.6

 
$
19.9