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Contracts with Customers - Contract Assets, Contract Liabilities and Receivable (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Contract with Customer, Asset, after Allowance for Credit Loss, Current [Abstract]      
Accrued revenue $ 20.2 $ 20.3  
Current contract assets 20.2 20.3  
Contract With Customer Liability Net Current [Abstract]      
Current deferred mobilization and contract preparation revenue/ Current contract liability (3.9) (2.6)  
Contract With Customer Liability Net Non-Current [Abstract]      
Non-current deferred mobilization and contract preparation revenue/ Non- current contract liability (2.5) 0.0  
Total contract liability $ (6.4) $ (2.6) $ (5.6)