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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Cash Flows from Operating Activities    
Net income $ 175.0 $ 54.4
Adjustments to reconcile net income (loss) to net cash (used in) operating activities:    
Depreciation and amortization 8.6 7.3
Accrued loss on long-term contract (7.2) (10.6)
Retirement benefit plans (gains) losses, net (50.5) 7.2
Revaluation of inventory borrowing 4.8 0.0
Equity Related Compensation 12.1 7.1
Changes in operating assets and liabilities:    
Accounts receivable – (increase) decrease 0.5 (8.6)
Increase (Decrease) in Inventories (10.7) 25.8
Payables under SWU purchase agreements – increase (decrease) 16.6 13.2
Deferred revenue, net of deferred costs – increase (decrease) 13.2 9.7
Accounts payable and other liabilities – increase (decrease) (4.6) (5.2)
Pension and postretirement liabilities - increase (decrease) (67.0) (32.7)
Increase (Decrease) in Deferred Income Taxes (39.5) (1.9)
Other, net (1.3) 1.4
Net cash used in operating activities 50.0 67.1
Cash Flows Provided by Investing Activities    
Capital expenditures (1.2) (1.4)
Net Cash Provided by (Used in) Investing Activities (1.2) (1.4)
Cash Flows Used in Financing Activities    
Proceeds from the sale of common stock, net 42.1 23.1
Redemption of preferred stock, net (44.4) (61.6)
Payment of interest classified as debt (6.1) (6.1)
Exercise of stock options 0.9 0.3
Shares withheld for employee taxes (2.4) 0.0
Payments for deferred issuance costs 0.0 (0.1)
Net cash used in financing activities (9.9) (44.4)
Decrease in cash, cash equivalents and restricted cash 38.9 21.3
Cash, cash equivalents and restricted cash, start of period 157.9 136.6
Cash, cash equivalents and restricted cash, end of period 196.8 157.9
Property, plant and equipment included in accounts payable and accrued liabilities    
Supplemental Cash Flow Information:    
Other Significant Noncash Transaction, Value of Consideration Given 0.0 (0.3)
Equity issuance costs included in accounts payable and accrued liabilities [Member]    
Supplemental Cash Flow Information:    
Other Significant Noncash Transaction, Value of Consideration Given (0.4) (0.2)
Disposal of right to use lease assets [Member]    
Supplemental Cash Flow Information:    
Other Significant Noncash Transaction, Value of Consideration Given (1.0) (0.2)
Reclassification of equity compensation liability to equity [Member]    
Supplemental Cash Flow Information:    
Other Significant Noncash Transaction, Value of Consideration Given (7.5) 0.0
Common stock and warrant issued in exchange for preferred stock [Member]    
Supplemental Cash Flow Information:    
Other Significant Noncash Transaction, Value of Consideration Given $ (7.5) 0.0
Preferred Series B [Member]    
Cash Flows Used in Financing Activities    
Redemption of preferred stock, net   $ (60.0)