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) (Details)

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Revenue, Contract Assets and Liabilities and Other Contract Matters -Summary of Remaining Performance Obligation by Operating Segment (Parenthetical) (Details)
$ in Millions
Sep. 30, 2020
USD ($)
vessel
Mar. 31, 2018
vessel
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Number of multi-purpose service vessels | vessel 2 2
Shipyard | Disputes    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Remaining performance obligation | $ $ 21.9