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Inventories (Schedule of Inventories) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Inventory, Net [Abstract] |  |
Separative work units inventory | $ 11.7 | $ 5.0
Uranium inventory | 394.2 | 156.6
Inventories | 416.3 | 161.6
Separative work units owed to customers and suppliers | 0.0 | 2.5
Uranium owed to customers and suppliers | 238.9 | 13.7
Inventories owed to customers and suppliers | 238.9 | 16.2
Separative work units net of liability | 11.7 | 2.5
Uranium inventory net of liability | 155.3 | 142.9
Conversion credits, net of liability | 10.4 | 0.0
Conversion credits owed to customers and suppliers | 0.0 | 0.0
Conversion credits, inventory | 10.4 | 0.0
Inventories, net | $ 177.4 | $ 145.4

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- 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 No definition available. + Details
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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. + References No definition available. + Details
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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. + References No definition available. + Details
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