Annual report pursuant to Section 13 and 15(d)

Shipyard Transaction and Discontinued Operations - Summary of Operating Results From Discontinued Operations (Parenthetical) (Details)

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Shipyard Transaction and Discontinued Operations - Summary of Operating Results From Discontinued Operations (Parenthetical) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Shipyard Transactions  
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]  
Estimated loss related to impairment of long lived assets and transaction costs $ 22.8
Additional loss related to additional transaction and other costs 2.6
Towing Salvage and Rescue Ship  
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]  
Change in estimated margins $ 8.4