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Other operating items
 12 Months Ended
Dec. 31, 2019
Other Operating Gains (Losses) [Abstract]  
Other operating items
Other operating items
Other operating items comprise the following: 
(In US$ millions)
2019
 
2018
 
2017
Loss on impairment of goodwill

—

 
(3.2
)
 
—

Revaluation of contingent consideration
0.7

 
—

 
89.9

Gain on sale of assets
—

 
—

 
0.8

Total
0.7

 
(3.2
)
 
90.7


During the year ended December 31, 2018, we recognized a loss on impairment of goodwill following early adoption of ASU 2017-04, Intangibles. For further information refer to Note 3 - ''Recent accounting standards''.
There was a gain on revaluation of contingent consideration of $0.7 million for the year ended December 31, 2019 and $89.9 million for the year ended December 31, 2017. These gains resulted from a decrease in the fair value of contingent liabilities to Seadrill relating to the purchase of the West Polaris in 2015.