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Discontinued Operations - Interest and Amortization (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Interest expense $ 21.4 $ 19.2
Revolving Credit Agreement | Marine Services | Discontinued Operations    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Interest expense 0.0 0.2
Amortization of deferred financing costs and original issuance discount 0.0 0.1
Secured Indenture | Marine Services | Discontinued Operations    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Interest expense 0.0 2.2
Amortization of deferred financing costs and original issuance discount 0.0 0.2
2020 Revolving Credit Agreement | Beyond6 | Discontinued Operations    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Interest expense 0.1 0.0
11.5% Senior Secured Notes | Beyond6 | Discontinued Operations    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Interest expense 0.3 0.8
Amortization of deferred financing costs and original issuance discount $ 0.0 $ 0.1