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Inventories (Schedule of Inventories) (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Inventory, Net [Abstract]
Separative work units inventory	$ 218.4	$ 330.6
Uranium inventory	39.2	131.4
Materials and supplies	0.2	0.2
Inventories	257.8	462.2
Separative work units owed to customers and suppliers	37.4	76.6
Uranium owed to customers and suppliers	32.0	82.3
Inventories owed to customers and suppliers	69.4	158.9
Separative work units net of liability	181.0	254.0
Uranium inventory net of liability	7.2	49.1
Inventories, net	$ 188.4	$ 303.3

X

- Definition

Cost of SWU and uranium inventories owed related to the transfer of title from USEC to customer at fabricator whereby fabricator has elected to order less material from USEC than is required. Amounts owed are satisfied when fabricator orders future bulk deliveries.

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- Definition

Inventory net of Liability

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- Definition

Carrying amount as of the balance sheet date of separative work unit ("SWU") inventory. SWU is held as the SWU component of low enriched uranium. A SWU is the standard measure of uranium enrichment using a standard formula derived from the physics of enrichment. SWU costs are based on production costs and purchase costs. SWU inventory is valued at the lower of cost or market.

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Separative work units inventory net of liability

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Separative work units owed to customers and suppliers

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- Definition

Carrying amount as of the balance sheet date of uranium inventory. Uranium is held in the form of natural uranium and as the uranium component of low enriched uranium. Uranium inventory is valued at the lower of cost or market.

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No definition available.

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- Definition

Uranium inventory net of liability

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Uranium owed to customers and suppliers

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- Definition

Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 210



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SX 210.5-02.6(a))



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Amount before valuation and LIFO reserves of other supplies used within the manufacturing or production process expected to be consumed within one year or operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Glossary Inventory



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