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Jack-Up Drilling Rigs, net and Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2025
Jack Up Rigs [Abstract]  
Schedule of Jack-Up Rigs
The carrying value of our jack-up rigs is as follows:
 As of December 31,
(In $ millions)20252024
Opening balance as of January 1,2,823.2 2,578.3 
Additions66.4 64.6 
Depreciation (146.9)(130.1)
Transfers from newbuildings — 310.4 
Ending balance as of December 31,2,742.7 2,823.2