Fresh Start Accounting (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended
Sep. 30, 2014	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2014
Payments of Financing Costs	$ 0.7us-gaap_PaymentsOfFinancingCosts
Enterprise Value	299.7leu_EnterpriseValue	299.7leu_EnterpriseValue	299.7leu_EnterpriseValue
Long-term debt	240.4us-gaap_LongTermDebt	240.4us-gaap_LongTermDebt	240.4us-gaap_LongTermDebt	240.4us-gaap_LongTermDebt
Interest Paid			15.9us-gaap_InterestPaid
Liabilities Subject to Compromise, 3% Convertible Senior Notes and Accrued Interest	547.4	547.4	547.4
Liabilities Subject to Compromise, Convertible Preferred Stock and Paid-in-Kind Dividends Payable	113.9	113.9	113.9
Liabilities Subject to Compromise, Accounts Payable and Accrued Liabilities	1.6	1.6	1.6
Fresh-Start Adjustment, Increase (Decrease), Inventories	35.4	35.4	35.4
Fresh-Start Adjustment, Increase (Decrease), Other Deferred Costs	(73.9)	(73.9)	(73.9)
Fresh-Start Adjustment, Increase (Decrease), Other Current Liabilities	(94.0)	(94.0)	(94.0)
Revaluation of deferred revenue, net of deferred costs		20.1
Fresh-Start Adjustment, Increase (Decrease), Amortizable Intangible Assets	123.5	123.5	123.5
Successor [Member]
Payments of Financing Costs				0
Enterprise Value	299.7	299.7	299.7
Long-term debt	240.4	240.4	240.4	240.4
Common Stock, Value, Outstanding	59.3	59.3	59.3
Common Stock, Shares, Outstanding	9.0	9.0	9.0
Shares Issued, Price Per Share	$ 6.59	$ 6.59	$ 6.59
Other Liabilities, Fair Value Disclosure	763.9	763.9	763.9
Reorganization Value	1,063.6	1,063.6	1,063.6
Interest Paid	15.9
Payments for Fees	1.5
Payment of Claims	1.6
Payment of Reorganization Adjustments	19.0
Intangible assets	123.5	123.5	123.5	119.2
Contract-Based Intangible Assets [Member]
Intangible assets	54.6	54.6	54.6
Contract-Based Intangible Assets [Member] \| Successor [Member]
Intangible assets	$ 54.6	$ 54.6	$ 54.6	$ 51.4

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