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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 12 Months Ended
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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

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