Quarterly report pursuant to Section 13 or 15(d)

Revenue, Contract Assets and Liabilities and Other Contract Matters - Summary of Remaining Performance Obligation by Operating Segment (Parenthetical 1) (Details)

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Revenue, Contract Assets and Liabilities and Other Contract Matters - Summary of Remaining Performance Obligation by Operating Segment (Parenthetical 1) (Details) - Shipyard
$ in Millions
Mar. 31, 2021
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance obligation expected to be recognized as revenue $ 2.9
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-04-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance obligation expected to be recognized as revenue $ 27.2
Revenue remaining performance obligation expected timing of satisfaction period 9 months