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Segment Information - Segment Reporting Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]          
Dayrate revenue $ 155.1 $ 87.7 $ 296.8 $ 151.0  
Gain on disposal 0.2 0.7 0.3 0.7  
Rig operating and maintenance expenses (89.5) (65.5) (175.0) (121.1)  
Depreciation of non-current assets (28.0) (29.5) (56.2) (59.0)  
Impairment of non-current assets   (124.4)   (124.4)  
General and administrative expenses (10.3) (9.6) (22.7) (18.8)  
Income / (loss) from equity method investments 3.9 (1.1) 6.3 0.0  
Operating income including equity method investments 63.8 (124.1) 112.2 (135.3)  
Total assets 2,996.1 2,990.5 2,996.1 2,990.5 $ 3,001.7
Related party          
Segment Reporting Information [Line Items]          
Related party revenue 32.4 17.6 62.7 36.3  
Operating segments | Dayrate          
Segment Reporting Information [Line Items]          
Dayrate revenue 236.9 139.3 454.7 254.8  
Gain on disposal 0.0 0.0 0.0 0.0  
Rig operating and maintenance expenses (169.7) (115.9) (329.7) (222.2)  
Depreciation of non-current assets (27.6) (29.1) (55.4) (58.2)  
Impairment of non-current assets   (124.4)   (124.4)  
General and administrative expenses 0.0 0.0 0.0 0.0  
Income / (loss) from equity method investments 0.0 0.0 0.0 0.0  
Operating income including equity method investments 39.6 (130.1) 69.6 (150.0)  
Total assets 3,276.9 3,226.5 3,276.9 3,226.5  
Operating segments | Dayrate | Related party          
Segment Reporting Information [Line Items]          
Related party revenue 0.0 0.0 0.0 0.0  
Segment reconciling items          
Segment Reporting Information [Line Items]          
Dayrate revenue (81.8) (51.6) (157.9) (103.8)  
Gain on disposal 0.2 0.7 0.3 0.7  
Rig operating and maintenance expenses 80.2 50.4 154.7 101.1  
Depreciation of non-current assets (0.4) (0.4) (0.8) (0.8)  
Impairment of non-current assets   0.0   0.0  
General and administrative expenses (10.3) (9.6) (22.7) (18.8)  
Income / (loss) from equity method investments 3.9 (1.1) 6.3 0.0  
Operating income including equity method investments 24.2 6.0 42.6 14.7  
Total assets (280.8) (236.0) (280.8) (236.0)  
Segment reconciling items | Related party          
Segment Reporting Information [Line Items]          
Related party revenue $ 32.4 $ 17.6 $ 62.7 $ 36.3