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Jack-up rigs (Tables)
12 Months Ended
Dec. 31, 2021
Jack Up Rigs [Abstract]  
Schedule of jack-up rigs
Set forth below is the carrying value of our jack-up rigs:
 As of December 31,
(In $ millions)20212020
Opening balance as of January 1,2,824.6 2,683.3 
Additions23.8 37.4 
Depreciation (117.6)(116.0)
Transfers from newbuildings (note 14)
— 312.7 
Disposals (note 6)
— (6.5)
Reclassification to asset held for sale— (9.2)
Impairment— (77.1)
Ending balance as of December 31,2,730.8 2,824.6 
Details of impairment loss on jack-up rigs
The Company recognized impairment losses for the years ended December 31, 2021, 2020 and 2019, as follows:

For the Years Ended December 31,
(In $ millions)202120202019
Atla (1)
— 30.9 — 
Balder (1)
— 27.8 — 
MSS1 (2)
— 18.4 — 
Eir (3)
— — 11.4 
Total 77.1 11.4