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Accounts Receivable (Tables)
12 Months Ended
Dec. 31, 2016
Accounts Receivable, Net, Current [Abstract]  
Schedule of Accounts Receivable
 
December 31,
 
2016
 
2015
 
(millions)
Utility customers and other
$
15.3

 
$
24.7

Contract services, primarily DOE
4.6

 
1.8

Accounts receivable, net
$
19.9

 
$
26.5