CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash Flows from Operating Activities
Net income (loss)	$ 38.0	$ (13.7)
Adjustments to reconcile net income (loss) to net cash (used in) operating activities:
Depreciation and amortization	4.7	4.5
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	7.0	31.3
Inventories, net – (increase) decrease	17.1	(9.3)
Accounts payable and other liabilities – increase (decrease)	(0.3)	(11.2)
Payables under SWU purchase agreements – increase (decrease)	(8.1)	(33.0)
Deferred revenue, net of deferred costs – increase (decrease)	(17.5)	18.9
Accrued loss on long-term contract, increase (decrease)	(8.7)
Pension and postretirement liabilities - increase (decrease)	(28.1)	(15.9)
Other, net	1.1	(0.8)
Net Cash (Used in) Operating Activities	5.2	(26.5)
Cash Flows Provided by Investing Activities
Capital expenditures	(0.9)	0.0
Proceeds from sales of assets	0.0	0.7
Net Cash Provided by (Used in) Investing Activities	(0.9)	0.7
Cash Flows Used in Financing Activities
Proceeds from the sale of common stock, net	23.8
Payment of interest classified as debt	(6.1)	(6.1)
Exercise of stock options	0.2	0.0
Principal payments on debt		(27.5)
Payments for deferred financing costs	(0.1)	(0.2)
Net Cash (Used in) Financing Activities	17.8	(33.8)
Decrease in cash, cash equivalents and restricted cash	22.1	(59.6)
Cash, cash equivalents and restricted cash, start of period	136.6	159.7
Cash, cash equivalents and restricted cash, end of period	158.7
Supplemental Cash Flow Information:
Interest paid	0.0	1.5
Conversion of interest payable-in-kind to long-term debt	0.0	0.7
Termination benefit costs	0.6
Deferred financing costs included in accounts payable and accrued liabilities [Member]
Supplemental Cash Flow Information:
Other Significant Noncash Transaction, Value of Consideration Given	(0.7)	(0.4)
Right to use lease assets acquired under operating lease [Member]
Supplemental Cash Flow Information:
Other Significant Noncash Transaction, Value of Consideration Received	0.0	2.9
Disposal of right to use lease assets for early termination [Member]
Supplemental Cash Flow Information:
Other Significant Noncash Transaction, Value of Consideration Given	0.0	(0.2)
Property, plant and equipment included in accounts payable and accrued liabilities [Member]
Supplemental Cash Flow Information:
Other Significant Noncash Transaction, Value of Consideration Given	$ (0.1)	$ 0.0