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Shipyard Transaction and Discontinued Operations - Summary of Operating Results From Discontinued Operations (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2021
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 | $ 1.9 | 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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