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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2012
Accounts Receivable and Other Current Assets  
Schedule of Accounts Receivable
December 31,
2012
2011
(millions)
Accounts receivable:
Utility customers
$ 118.3 $ 124.2
Contract services, primarily Department of Energy:
Billed revenue
10.5 18.8
Unbilled revenue
6.0 19.0
16.5 37.8
$ 134.8 $ 162.0
Schedule of Other Current Assets
Other current assets:
         Prepayments to American Centrifuge suppliers
$ - $ 21.1
         Prepaid taxes, power purchases and insurance
4.0 29.4
         Deferred financing costs for credit facility
3.0 2.4
         Other
12.2 11.9
$ 19.2 $ 64.8