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Segment information (Tables)
 12 Months Ended
Dec. 31, 2015
Segment Reporting [Abstract]  
Schedule of contract revenue split by customer
A breakdown of the Company’s revenues by customer for the years ended December 31, 2015, 2014 and 2013 is as follows:
 
 
2015
 
2014
 
2013
BP
44.8
%
 
41.5
%
 
35.0
%
ExxonMobil *
32.1
%
 
26.4
%
 
14.5
%
Tullow
13.5
%
 
17.4
%
 
18.8
%
Chevron
8.5
%
 
14.7
%
 
12.1
%
Total
—
%
 
—
%
 
19.6
%
Other
1.1
%
 
—
%
 
—
%
Total
100.0
%
 
100.0
%
 
100.0
%


* The ExxonMobil drilling contract for the West Aquarius was assigned to Hibernia Management and Development Co. Ltd during 2015, 2014 and part of 2013 and to Statoil Canada Ltd. during part of 2013.
Company's revenues and fixed assets by geographic area
The following presents the revenues for the years ended December 31, 2015, 2014 and 2013 and fixed assets as of December 31, 2015 and 2014 by geographic area:
Revenues

(In US$ millions)
2015
 
2014
 
2013
United States
$
781.1

 
$
556.6

 
$
370.4

Nigeria
250.1

 
228.5

 
213.3

Ghana
234.7

 
233.5

 
198.6

Canada
190.9

 
126.1

 
153.5

Angola
179.4

 
92.3

 
87.9

Thailand
99.8

 
105.6

 
40.6

Other
5.6

 
—

 
—

Total
$
1,741.6

 
$
1,342.6

 
$
1,064.3

Fixed Assets—Drilling Units (1)
 
(In US$ millions)
2015
 
2014
United States
$
2,927.4

 
$
3,024.3

Ghana
591.5

 
608.4

Angola
571.3

 
182.5

Canada
519.2

 
539.3

Nigeria
508.0

 
525.4

Thailand
251.5

 
261.2

Myanmar
178.4

 
—

Total
$
5,547.3

 
$
5,141.1


(1)
The fixed assets referred to in the table above include the eleven drilling units at December 31, 2015 and ten drilling units at December 31, 2014. Asset locations at the end of a period are not necessarily indicative of the geographic distribution of the revenues or operating profits generated by such assets during such period.