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Segments - Segment Reporting Information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
segment
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Aug. 04, 2021
Segment Reporting Information [Line Items]        
Number of operating segments | segment 2      
Dayrate revenue $ 205.8 $ 265.2 $ 327.6  
Related party revenue 39.5 42.3 6.5  
Intersegment revenue 0.0 0.0 0.0  
Gain on disposals 1.2 19.0 6.4  
Rig operating and maintenance expenses (180.5) (270.4) (307.9)  
Intersegment expenses 0.0 0.0 0.0  
Depreciation of non-current assets (119.6) (117.9) (101.4)  
Impairment of non-current assets   (77.1) (11.4)  
Amortization of acquired contract backlog     (20.2)  
General and administrative expenses (34.7) (49.1) (50.4)  
Income/(loss) from equity method investments 16.1 9.5 (9.0)  
Operating (loss)/income including equity method investment (72.2) (178.5) (159.8)  
Total assets 3,080.3 3,171.1 3,280.0  
Operating Segments | Dayrate        
Segment Reporting Information [Line Items]        
Dayrate revenue 205.8 265.2 327.6  
Related party revenue 39.5 42.3 6.5  
Gain on disposals 0.0 0.0 0.0  
Rig operating and maintenance expenses (339.7) (437.4) (355.3)  
Depreciation of non-current assets (117.6) (116.0) (100.1)  
Impairment of non-current assets   (77.1) (11.4)  
Amortization of acquired contract backlog     (20.2)  
General and administrative expenses 0.0 0.0 0.0  
Income/(loss) from equity method investments 0.0 0.0 0.0  
Operating (loss)/income including equity method investment (123.5) (143.4) (103.1)  
Total assets 2,883.0 3,368.3 3,358.0  
Operating Segments | IWS        
Segment Reporting Information [Line Items]        
Dayrate revenue 301.6 386.2 68.1  
Related party revenue 0.0 0.0 0.0  
Gain on disposals 0.0 0.0 0.0  
Rig operating and maintenance expenses (186.3) (167.9) (35.9)  
Depreciation of non-current assets 0.0 0.0 0.0  
Impairment of non-current assets   0.0 0.0  
Amortization of acquired contract backlog     0.0  
General and administrative expenses 0.0 0.0 0.0  
Income/(loss) from equity method investments 0.0 0.0 0.0  
Operating (loss)/income including equity method investment 26.8 38.7 (17.6)  
Total assets 0.0 336.5 81.3  
Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Intersegment revenue (88.5) (179.6) (49.8)  
Intersegment expenses 88.5 179.6 49.8  
Intersegment Eliminations | Dayrate        
Segment Reporting Information [Line Items]        
Intersegment revenue 88.5 179.6 49.8  
Intersegment expenses 0.0 0.0 0.0  
Intersegment Eliminations | IWS        
Segment Reporting Information [Line Items]        
Intersegment revenue 0.0 0.0 0.0  
Intersegment expenses (88.5) (179.6) (49.8)  
Segment Reconciling Items        
Segment Reporting Information [Line Items]        
Dayrate revenue (301.6) (386.2) (68.1)  
Related party revenue 0.0 0.0 0.0  
Gain on disposals 1.2 19.0 6.4  
Rig operating and maintenance expenses 345.5 334.9 83.3  
Depreciation of non-current assets (2.0) (1.9) (1.3)  
Impairment of non-current assets   0.0 0.0  
Amortization of acquired contract backlog     0.0  
General and administrative expenses (34.7) (49.1) (50.4)  
Income/(loss) from equity method investments 16.1 9.5 (9.0)  
Operating (loss)/income including equity method investment 24.5 (73.8) (39.1)  
Total assets 197.3 (533.7) $ (159.3)  
Akal        
Segment Reporting Information [Line Items]        
Ownership percentage sold       49.00%
Income/(loss) from equity method investments (1.0) (1.7)    
Total assets   116.5    
Opex        
Segment Reporting Information [Line Items]        
Ownership percentage sold       49.00%
Income/(loss) from equity method investments $ 14.1 5.3    
Total assets   $ 220.0