Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Revenue Recognition and Contracts with Customers (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jul. 26, 2018	Jan. 01, 2018	Dec. 31, 2017
Advances from customers, noncurrent	$ 14.5	$ 14.5			$ 0.0
Deferred revenue, revenue recognized		2.7
Accounts receivable, net	27.9	27.9		$ 60.3	60.2
Advances from customers	1.9	1.9
Government [Member]
Litigation Settlement, Amount Awarded from Other Party	24.0
Accounts receivable, net					14.5
Proceeds from Customers	4.7
Advances from customers					19.3
Gain (Loss) Related to Litigation Settlement	9.5
Low Enriched Uranium Segment [Member]
Revenue, Remaining Performance Obligation	$ 1,300.0	$ 1,300.0			$ 1,300.0
Scenario, Forecast [Member] \| Low Enriched Uranium Segment [Member]
Revenue, Remaining Performance Obligation			$ 1,100.0