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Other Non-Current Assets (Details)
$ in Millions
Jun. 30, 2023
USD ($)
rig
contract
Dec. 31, 2022
USD ($)
Disaggregation of Revenue [Line Items]    
Deferred mobilization and contract preparation cost $ 24.1 $ 17.1
Deferred tax asset 2.6 3.5
Liquidated damages $ 1.4 $ 2.3
Right-of-use asset, non-current [extensible list] Other non-current assets Other non-current assets
Right-of-use lease asset, non-current $ 1.4 $ 1.7
Non-current accrued revenue 1.9 3.8
VAT receivable 0.4 0.4
Prepayments 0.3 0.2
Other non-current assets $ 30.7 26.7
Contracts with delayed start date | contract 2  
Rigs to be billed upon completion | rig 1  
Deferred demobilization revenue    
Disaggregation of Revenue [Line Items]    
Non-current accrued revenue $ 0.5 $ 1.5