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Jack-Up Rigs - Schedule of Jack-Up Rigs (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Jack Up Rigs [Roll Forward]    
Opening balance $ 2,589.1 $ 2,730.8
Additions 65.2 100.2
Depreciation and amortization (55.4) (114.9)
Disposals 0.0 (119.7)
Impairment 0.0 (7.3)
Total $ 2,598.9 $ 2,589.1