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Revenue and Contracts with Customers (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Deferred revenue, revenue recognized		$ 28.5	$ 0.0
Separative work units owed to others	$ 25.5	25.5		$ 20.7
Separative work units owed to others current	3.0	3.0
Separative work units owed to others noncurrent	22.5	22.5
Separative work units owed to others valuation adjustment	4.8
Government cost share portion	117.9	117.9
Accounts receivable, net	16.9	16.9		29.6
Proceeds from settlement with customer		43.5
Revenue, remaining performance obligation, amount	1,000.0	1,000.0		960.0
Gain Related to Litigation Settlement		43.5
Minimum [Member]
Company cost share portion					$ 18.3
Maximum [Member]
Government cost share portion	115.0	115.0
Government [Member]
Provision for Loss on Contracts	1.2	1.2		$ 7.0
Proceeds from Customers	$ 101.9
Pension Plan, Defined Benefit [Member]
Defined Contribution Plan, Employer Supplemental Contribution Amount		33.8
Other Postretirement Benefits Plan [Member]
Defined Contribution Plan, Employer Supplemental Contribution Amount		$ 9.7

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Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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