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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash Flows from Operating Activities      
Net income $ 84.4 $ 52.2 $ 175.0
Adjustments to reconcile net income (loss) to net cash (used in) operating activities:      
Depreciation and amortization 7.1 9.6 8.6
Accrued loss on long-term contract (20.0) 19.5 (7.2)
Increase (Decrease) in Deferred Income Taxes 1.6 (14.7) 39.5
Retirement benefit plans (gains) losses, net (24.6) 7.8 (50.5)
Revaluation of inventory borrowing 7.4 8.0 4.8
Equity Related Compensation 2.3 1.9 12.1
Other Operating Activities, Cash Flow Statement (1.6) 0.0 0.0
Changes in operating assets and liabilities:      
Accounts receivable – (increase) decrease (11.3) (9.0) 0.5
Increase (Decrease) in Inventories (83.8) (88.5) (14.2)
Increase Decrease in Inventories Owed to Suppliers 23.5 52.4 3.5
Increase (Decrease) in Other Current Assets 14.9 (15.6) (1.0)
Payables under SWU purchase agreements – increase (decrease) (1.7) 5.7 16.6
Deferred revenue, net of deferred costs – increase (decrease) 12.1 (22.5) 13.2
Accounts payable and other liabilities – increase (decrease) 8.5 2.6 (4.6)
Pension and postretirement liabilities - increase (decrease) (5.7) (18.1) (67.0)
Other, net (0.8) (0.1) (0.3)
Net cash used in operating activities 9.1 20.6 50.0
Cash Flows Provided by Investing Activities      
Capital expenditures (1.6) (0.7) (1.2)
Net Cash Provided by (Used in) Investing Activities (1.6) (0.7) (1.2)
Cash Flows Used in Financing Activities      
Proceeds from the sale of common stock, net (23.2) (3.6) (42.1)
Redemption of preferred stock, net 0.0 0.0 (44.4)
Repayments of Debt (6.1) (6.1) (6.1)
Exercise of stock options 0.0 0.4 0.9
Shares withheld for employee taxes (3.0) (1.9) (2.4)
Proceeds from (Payments for) Other Financing Activities (0.2) (0.3) 0.0
Net cash used in financing activities 13.9 (4.3) (9.9)
Decrease in cash, cash equivalents and restricted cash 21.4 15.6 38.9
Cash, cash equivalents and restricted cash, start of period 212.4 196.8 157.9
Cash, cash equivalents and restricted cash, end of period 233.8 212.4 196.8
Property, plant and equipment included in accounts payable and accrued liabilities      
Supplemental Cash Flow Information:      
Other Significant Noncash Transaction, Value of Consideration Given 0.9 0.2 0.0
Other Significant Noncash Transaction, Value of Consideration Given (0.9) (0.2) 0.0
Equity issuance costs included in accounts payable and accrued liabilities [Member]      
Supplemental Cash Flow Information:      
Other Significant Noncash Transaction, Value of Consideration Given 0.0 0.2 0.4
Other Significant Noncash Transaction, Value of Consideration Given 0.0 (0.2) (0.4)
Disposal of right to use lease assets [Member]      
Supplemental Cash Flow Information:      
Other Significant Noncash Transaction, Value of Consideration Given 0.0 0.0 1.0
Other Significant Noncash Transaction, Value of Consideration Given 0.0 0.0 (1.0)
Reclassification of equity compensation liability to equity [Member]      
Supplemental Cash Flow Information:      
Other Significant Noncash Transaction, Value of Consideration Given 0.0 10.6 7.5
Other Significant Noncash Transaction, Value of Consideration Given 0.0 (10.6) (7.5)
Common stock and warrant issued in exchange for preferred stock [Member]      
Supplemental Cash Flow Information:      
Other Significant Noncash Transaction, Value of Consideration Given 0.0 0.0 7.5
Other Significant Noncash Transaction, Value of Consideration Given 0.0 0.0 (7.5)
Adjustment to Right of Use Lease due to Modification [Domain]      
Supplemental Cash Flow Information:      
Other Significant Noncash Transaction, Value of Consideration Given (4.2) 6.6 0.0
Other Significant Noncash Transaction, Value of Consideration Given 4.2 (6.6) 0.0
Distributed Earnings Allocable to Warrant Modification [Domain]      
Supplemental Cash Flow Information:      
Other Significant Noncash Transaction, Value of Consideration Given 0.0 1.5 0.0
Other Significant Noncash Transaction, Value of Consideration Given $ 0.0 $ (1.5) $ 0.0