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Gain on Disposals (Tables)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Gain (Loss) on Disposition of Assets [Abstract]    
(Losses) / Gains on Disposal of Rigs
We recognized the following losses and gains on disposal for the year ended December 31, 2021:

Year Ended December 31, 2021
(in $ millions)Net proceedsBook value on disposal(Loss)/gain on disposal
Balder (1)
4.4 4.5 (0.1)
Rig Related Equipment1.3  1.3 
Total5.74.51.2

(1) Of the net proceeds received from the sale of the "Balder", $3.0 million was received during the year ended December 31, 2020.
We recognized the following gains and losses on disposal for the year ended December 31, 2020:

Year ended December 31, 2020
(In $ millions)Net proceedsBook value on disposalGain/(loss) on disposal
B1527.9 1.4 6.5 
Dhabi II7.9 1.6 6.3 
Atla
10.0 5.0 5.0 
MSS1
2.2 2.2 — 
Eir
3.0 3.0 — 
B3910.4 0.8 (0.4)
Rig Related Equipment3.3 1.7 1.6 
Total34.715.719.0
We recognized the following gains on disposal for the year ended December 31, 2019:

Year ended December 31, 2019
(In $ millions)Net proceedsBook value on disposalGain on disposal
Baug3.0 — 3.0 
C200513.0 2.1 0.9 
Rig Related Equipment2.5 — 2.5 
Total8.5 2.1 6.4