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Revenue and Contracts with Customers (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2019
Deferred revenue, revenue recognized		$ 28.5	$ 0.0
Government cost obligation	$ 113.4	113.4
Accounts receivable, net	19.0	19.0		$ 29.6
Revenue, remaining performance obligation, amount	1,000.0	1,000.0		960.0
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	3.1	$ 3.1		$ 7.0
Proceeds from Customers	$ 86.5

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
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Cash receipts from customers during the current period which are usually for sales of goods and services.

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Cumulative provision for contract losses not offset against related costs accumulated on the balance sheet.

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