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Pension and Postretirement Health and Life Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	May 28, 2024
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Pension Plan Obligations Transferred		$ 15.4		$ 15.4	$ 234.0
Customer A [Member] | Low Enriched Uranium Segment [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Revenue	$ 34.1	34.8	$ 67.5	69.3
Customer A [Member] | Technical Solutions Segment [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Revenue	29.0	$ 21.6	78.6	60.3
Customer B [Member] | Low Enriched Uranium Segment [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Revenue	$ 10.7		35.7	42.3
Customer C [Member] | Low Enriched Uranium Segment [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Revenue			34.1	35.4
Customer D [Member] | Low Enriched Uranium Segment [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Revenue			$ 32.8	$ 30.2

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