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Shipyard Transaction and Discontinued Operations - Summary of Operating Results From Discontinued Operations (Parenthetical) (Details) $ in Millions | 9 Months Ended
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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

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