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Segment Information (Tables)

12 Months Ended

Dec. 31, 2017

Segment Reporting Information, Revenue for Reportable Segment [Abstract]

Segment Reporting Information

	Year Ended December 31,
($ millions)	2017				2016
Revenue
LEU segment:
Separative work units	$	195.4			$	258.5
Uranium	—				14.3
	195.4				272.8
Contract services segment	23.0				38.5
Revenue	$	218.4			$	311.3
Segment Gross Profit
LEU segment	$	59.3			$	38.5
Contract services segment	(2.5		)		6.6
Gross profit	$	56.8			$	45.1

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block]

Revenue by customer location, including customers in a foreign country representing 10% or more of total revenue, follows:

	Year Ended December 31,
($ millions)	2017				2016
United States	$	134.5			$	242.8
Foreign:
Japan	49.0				49.1
Belgium	34.9				—
Other	—				19.4
	83.9				68.5
Total revenue	$	218.4			$	311.3

X

- Definition

Tabular disclosure of the names of foreign countries from which revenue is material and the amount of revenue from external customers attributed to those countries. An entity may also provide subtotals of geographic information about groups of countries.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599

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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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-Subparagraph (SX 210.5-03.1)
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- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 30
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599

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-Publisher FASB
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