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Revenue and Contracts with Customers (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Revenue, nonmonetary transaction |  |  |  | $ 23.4 |  |
Nonmonetary transaction, amount of barter transaction |  | $ 15.0 |  | 44.4 |  |
Deferred revenue, revenue recognized |  |  |  | 5.2 |  |
Separative work units owed to others new borrowings |  |  | $ 1.7 |  |  |
Separative work units owed to others noncurrent | $ 10.8 |  |  | 10.8 |  |
Government cost obligation | 74.5 |  |  | 74.5 |  |
Loss on contracts |  |  |  |  | $ 0.0 |
Provision for Loss on Contracts | 8.9 |  |  | 8.9 |  |
Accounts receivable, net | 14.1 |  |  | 14.1 |  | $ 21.1
Proceeds from settlement with customer |  |  |  | 32.4 |  |
Revenue, remaining performance obligation, amount | 1,000.0 |  |  | 1,000.0 |  |
Deferred Revenue and Advances from Customers Approximate | 300.0 |  |  | 300.0 |  |
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 | 8.9 |  |  | $ 8.9 |  | $ 10.0
Proceeds from Customers | $ 41.5 |  |  |  |  |

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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 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4531-111522 + Details
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