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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Cash Flows from Operating Activities    
Net income (loss) $ 12.2 $ (67.0)
Adjustments to reconcile net income (loss) to net cash (used in) operating activities:    
Depreciation and amortization 12.0 13.1
Immediate recognition of net actuarial losses (25.8) 1.4
Interest on paid-in-kind toggle notes 2.9 9.7
Gain on early extinguishment of debt and debt restructuring costs (33.6) (16.7)
Gain on sale of assets (4.6) (1.2)
Non-cash reorganization items 0.0 3.0
Changes in operating assets and liabilities:    
Accounts receivable – (increase) decrease (17.6) 6.5
Inventories, net – (increase) decrease 44.7 89.5
Payables under SWU purchase agreements – increase (decrease) 19.8 (25.8)
Deferred revenue, net of deferred costs – increase (decrease) 15.9 13.4
Accounts payable and other liabilities – (decrease) (43.8) 10.4
Other, net (7.2) 1.4
Net Cash (Used in) Operating Activities (25.1) 37.7
Cash Flows Provided by Investing Activities    
Capital expenditures (0.5) (3.0)
Proceeds from sales of assets 4.7 1.5
Deposits for surety bonds - net (increase) decrease 0.0 0.3
Net Cash Provided by Investing Activities 4.2 (1.2)
Cash Flows Used in Financing Activities    
Common stock issued (purchased), net 27.6 9.8
Payment of interest classified as debt (3.4)  
Net Cash (Used in) Financing Activities (31.0) (9.8)
Net (Decrease) (51.9) 26.7
Cash and Cash Equivalents at Beginning of Period 260.7 234.0
Cash and Cash Equivalents at End of Period 208.8 260.7
Supplemental Cash Flow Information:    
Interest paid 4.2 6.5
Exchange of debt for Series B preferred stock 4.6  
Conversion of interest payable-in-kind to long-term debt $ 0.4 $ 3.4