Quarterly report pursuant to Section 13 or 15(d)

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

v3.22.2.2
Shipyard Transaction and Discontinued Operations - Summary of Operating Results From Discontinued Operations (Parenthetical) (Details)
$ in Millions
9 Months Ended
Sep. 30, 2021
USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]  
Change in estimated margins $ 3.3
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