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Accounts Receivable (Tables)
6 Months Ended
Jun. 30, 2015
Accounts Receivable, Net, Current [Abstract]  
Schedule of Accounts Receivable
 
June 30,
2015
 
December 31,
2014
 
(millions)
Utility customers and other
$
11.9

 
$
36.3

Contract services, primarily DOE
15.2

 
22.6

Accounts receivable, net
$
27.1

 
$
58.9