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Drilling rigs (Tables)
 12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Drilling rigs
(In US$ millions)
December 31,
2015
 
December 31,
2014
Cost
6,434.2

 
5,790.5

Accumulated depreciation
(886.9
)
 
(649.4
)
Net book value
5,547.3

 
5,141.1