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Revenue, Contract Assets and Liabilities and Other Contract Matters - Summary of Remaining Performance Obligation by Operating Segment (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Apr. 19, 2021
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Performance obligation sold | $ 3.5 | $ 17.0 |
Shipyard |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Performance obligation expected to be recognized as revenue | 2.9 |  |
Shipyard | Divested Shipyard Contracts |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Performance obligation sold | $ 309.5 |  |
Subsequent Event | Shipyard | Divested Shipyard Contracts | Minimum |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Performance obligation expected to be recognized as revenue |  |  | $ 5.0
Subsequent Event | Shipyard | Divested Shipyard Contracts | Maximum |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |  |
Performance obligation expected to be recognized as revenue |  |  | $ 10.0

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- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + 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 (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 + Details
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