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Inventories (Schedule of Inventories) (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Inventory, Net [Abstract]
Separative work units inventory	$ 17.1	$ 5.0
Uranium inventory	303.4	156.6
Inventories	320.5	161.6
Separative work units owed to customers and suppliers	0.0	2.5
Uranium owed to customers and suppliers	127.4	13.7
Inventories owed to customers and suppliers	127.4	16.2
Separative work units net of liability	17.1	2.5
Uranium inventory net of liability	176.0	142.9
Inventories, net	$ 193.1	$ 145.4

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.

+ References

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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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- Definition

Separative work units inventory net of liability

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- Definition

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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- Definition

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/exampleRef
-Topic 852
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481372/852-10-55-10

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483467/210-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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