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Accounts Receivable (Tables)
3 Months Ended
Mar. 31, 2016
Accounts Receivable, Net, Current [Abstract]  
Schedule of Accounts Receivable
 
March 31,
2016
 
December 31,
2015
 
(in millions)
Utility customers and other
$
38.1

 
$
24.7

Contract services, primarily DOE
17.8

 
1.8

Accounts receivable
$
55.9

 
$
26.5