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Jack-up rigs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Jack Up Rigs [Roll Forward]    
Opening balance as of January 1, $ 2,824.6 $ 2,683.3
Additions 23.8 37.4
Depreciation (117.6) (116.0)
Transfers from newbuildings (note 14) 0.0 312.7
Disposals (note 6) 0.0 (6.5)
Reclassification to asset held for sale 0.0 (9.2)
Impairment 0.0 (77.1)
Ending balance as of December 31, $ 2,730.8 $ 2,824.6