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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash Flows from Operating Activities    
Net income (loss) $ 54.4 $ (16.5)
Adjustments to reconcile net income (loss) to net cash (used in) operating activities:    
Depreciation and amortization 7.3 7.0
Accrued loss on long-term contract (10.6) 18.3
Immediate recognition of retirement benefit plans (gains) losses, net 7.2 (4.0)
Interest on paid-in-kind toggle notes 0.0 1.1
Gain on sale of assets 0.0 (0.7)
Inventory valuation adjustments 0.0 2.3
Changes in operating assets and liabilities:    
Accounts receivable – (increase) decrease (8.6) 29.3
Inventories, net – (increase) decrease 25.8 0.1
Payables under SWU purchase agreements – increase (decrease) 13.2 (37.9)
Deferred revenue, net of deferred costs – increase (decrease) 9.7 44.0
Accounts payable and other liabilities – increase (decrease) 1.5 (12.3)
Pension and postretirement liabilities - increase (decrease) (32.7) (19.5)
Other, net (0.1) 0.1
Net Cash (Used in) Operating Activities 67.1 11.3
Cash Flows Provided by Investing Activities    
Capital expenditures (1.4) (0.1)
Proceeds from sales of assets 0.0 0.7
Net Cash Provided by (Used in) Investing Activities (1.4) 0.6
Cash Flows Used in Financing Activities    
Proceeds from Issuance of Common Stock 23.1 0.0
Payments for Repurchase of Preferred Stock and Preference Stock (61.6) 0.0
Payment of interest classified as debt (6.1) (6.1)
Proceeds from Stock Options Exercised 0.3 0.0
Payment of Financing and Stock Issuance Costs (0.1) (1.4)
Principal payments on debt 0.0 (27.5)
Net cash used in financing activities (44.4) (35.0)
Decrease in cash, cash equivalents and restricted cash 21.3 (23.1)
Cash, cash equivalents and restricted cash, start of period 136.6 159.7
Cash, cash equivalents and restricted cash, end of period 157.9 136.6
Supplemental Cash Flow Information:    
Interest paid 0.0 1.5
Conversion of interest payable-in-kind to long-term debt 0.0 0.7
Property, plant and equipment included in accounts payable and accrued liabilities    
Supplemental Cash Flow Information:    
Other Significant Noncash Transaction, Value of Consideration Given (0.3) 0.0
Deferred financing costs included in accounts payable and accrued liabilities [Member]    
Supplemental Cash Flow Information:    
Other Significant Noncash Transaction, Value of Consideration Given (0.2) (0.8)
Disposal of right to use lease assets for early termination [Member]    
Supplemental Cash Flow Information:    
Other Significant Noncash Transaction, Value of Consideration Given (0.2) (0.4)
Right to use lease assets acquired under operating leases [Member]    
Supplemental Cash Flow Information:    
Other Significant Noncash Transaction, Value of Consideration Received 0.0 $ 5.2
Preferred Series B [Member]    
Cash Flows Used in Financing Activities    
Payments for Repurchase of Preferred Stock and Preference Stock $ (60.0)