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Revenue and Contracts with Customers (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Deferred revenue, revenue recognized | $ 28.5 | $ 0.0 |  |
Government cost obligation | 102.8 |  |  |
Loss on contracts |  | $ (3.5) |  |
Accounts receivable, net | 15.5 |  | $ 29.6 |
Revenue, remaining performance obligation, amount | 989.0 |  | 960.0 |
Minimum [Member] |  |  |  |
Company cost share portion |  |  |  | $ 18.3
Maximum [Member] |  |  |  |
Government cost share portion | 115.0 |  |  |
Government [Member] |  |  |  |
Provision for Loss on Contracts | 5.7 |  | $ 7.0 |
Proceeds from Customers | $ 69.6 |  |  |

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