Name:	us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015
Cash Flows from Operating Activities
Net income (loss)	$ (15.4)us-gaap_NetIncomeLoss	$ (50.8)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash (used in) operating activities:
Interest on paid-in-kind toggle notes			3.6us-gaap_PaidInKindInterest
Cash Flows Used in Financing Activities
Cash and Cash Equivalents at Beginning of Period	218.8
Cash and Cash Equivalents at End of Period	225.0		225.0
Predecessor [Member]
Cash Flows from Operating Activities
Net income (loss)		(50.8)
Adjustments to reconcile net income (loss) to net cash (used in) operating activities:
Depreciation and amortization		2.8
Interest on paid-in-kind toggle notes		0
Gain on sales of assets		0
Reorganization items, non-cash		1.6
Changes in operating assets and liabilities:
Accounts receivable – (increase) decrease		125.0
Inventories, net – (increase) decrease		53.6
Payables under SWU purchase agreements – increase (decrease)		(340.7)
Deferred revenue, net of deferred costs – increase (decrease)		(5.7)
Accounts payable and other liabilities – (decrease)		(16.3)
Other, net		0.8
Net Cash (Used in) Operating Activities		(229.7)
Cash Flows Provided by Investing Activities
Deposits for surety bonds - net (increase) decrease		0.6
Proceeds from sales of assets		0
Net Cash Provided by Investing Activities		0.6
Cash Flows Used in Financing Activities
Net Cash (Used in) Financing Activities		0
Net (Decrease)		(229.1)
Cash and Cash Equivalents at Beginning of Period		314.2
Cash and Cash Equivalents at End of Period		85.1
Successor [Member]
Cash Flows from Operating Activities
Net income (loss)	(15.4)
Adjustments to reconcile net income (loss) to net cash (used in) operating activities:
Depreciation and amortization	4.2
Interest on paid-in-kind toggle notes	1.8
Gain on sales of assets	(0.8)
Reorganization items, non-cash	0
Changes in operating assets and liabilities:
Accounts receivable – (increase) decrease	37.2
Inventories, net – (increase) decrease	124.1
Payables under SWU purchase agreements – increase (decrease)	(140.1)
Deferred revenue, net of deferred costs – increase (decrease)	(1.9)
Accounts payable and other liabilities – (decrease)	(8.6)
Other, net	1.8
Net Cash (Used in) Operating Activities	2.3
Cash Flows Provided by Investing Activities
Deposits for surety bonds - net (increase) decrease	3.7
Proceeds from sales of assets	0.2
Net Cash Provided by Investing Activities	3.9
Cash Flows Used in Financing Activities
Net Cash (Used in) Financing Activities	0
Net (Decrease)	6.2
Cash and Cash Equivalents at Beginning of Period	218.8
Cash and Cash Equivalents at End of Period	225.0		225.0
Supplemental Cash Flow Information:
Interest paid	6.0
Conversion of interest payable-in-kind to long-term debt	$ 1.8