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Segment Information
 6 Months Ended
Jun. 30, 2016
Segment Reporting Information, Revenue for Reportable Segment [Abstract]  
Segment Information
Segment Information
 
Our business consists of three operating segments: (1) Floaters, which includes our drillships and semisubmersible rigs, (2) Jackups and (3) Other, which consists of management services on rigs owned by third-parties. Our two reportable segments, Floaters and Jackups, provide one service, contract drilling.
    
Segment information for the three-month and six-month periods ended 2016 and 2015 is presented below (in millions). General and administrative expense and depreciation expense incurred by our corporate office are not allocated to our operating segments for purposes of measuring segment operating income and are included in "Reconciling Items." We measure segment assets as property and equipment.

Three Months Ended June 30, 2016
 
Floaters
 
Jackups
 
Other
 
Operating Segments Total
 
Reconciling Items
 
Consolidated Total
Revenues
$
636.4

 
$
251.3

 
$
21.9

 
$
909.6

 
$
—

 
$
909.6

Operating expenses
 
 
 
 
 
 
 
 
 
 
 
Contract drilling (exclusive of depreciation)
208.6

 
122.3

 
19.3

 
350.2

 
—

 
350.2

Depreciation
77.8

 
30.1

 
—

 
107.9

 
4.5

 
112.4

General and administrative
—

 
—

 
—

 
—

 
27.4

 
27.4

Operating income
$
350.0

 
$
98.9

 
$
2.6

 
$
451.5

 
$
(31.9
)
 
$
419.6

Property and equipment, net
$
8,414.1

 
$
2,543.0

 
$
—

 
$
10,957.1

 
$
64.1

 
$
11,021.2


Three Months Ended June 30, 2015
 
Floaters
 
Jackups
 
Other
 
Operating Segments Total
 
Reconciling Items
 
Consolidated Total
Revenues
$
634.3

 
$
384.1

 
$
40.6

 
$
1,059.0

 
$
—

 
$
1,059.0

Operating expenses
 
 
 
 
 
 
 
 
 
 
 
Contract drilling (exclusive of depreciation)
277.7

 
192.7

 
32.2

 
502.6

 
—

 
502.6

Depreciation
94.4

 
43.6

 
—

 
138.0

 
2.5

 
140.5

General and administrative
—

 
—

 
—

 
—

 
29.7

 
29.7

Operating income
$
262.2

 
$
147.8

 
$
8.4

 
$
418.4

 
$
(32.2
)
 
$
386.2

Property and equipment, net
$
9,870.7

 
$
3,223.4

 
$
—

 
$
13,094.1

 
$
75.8

 
$
13,169.9


Six Months Ended June 30, 2016
 
Floaters
 
Jackups
 
Other
 
Operating Segments Total
 
Reconciling Items
 
Consolidated Total
Revenues
$
1,149.0

 
$
529.2

 
$
45.4

 
$
1,723.6

 
$
—

 
$
1,723.6

Operating expenses
 
 
 
 
 
 
 
 
 
 
 
Contract drilling (exclusive of depreciation)
419.9

 
256.8

 
37.2

 
713.9

 
—

 
713.9

Depreciation
158.1

 
58.7

 
—

 
216.8

 
8.9

 
225.7

General and administrative
—

 
—

 
—

 
—

 
50.8

 
50.8

Operating income
$
571.0

 
$
213.7

 
$
8.2

 
$
792.9

 
$
(59.7
)
 
$
733.2

Property and equipment, net
$
8,414.1

 
$
2,543.0

 
$
—

 
$
10,957.1

 
$
64.1

 
$
11,021.2


Six Months Ended June 30, 2015
 
Floaters
 
Jackups
 
Other
 
Operating Segments Total
 
Reconciling Items
 
Consolidated Total
Revenues
$
1,329.3

 
$
812.4

 
$
81.2

 
$
2,222.9

 
$
—

 
$
2,222.9

Operating expenses
 
 
 
 
 
 
 
 
 
 
 
Contract drilling (exclusive of depreciation)
571.2

 
384.2

 
65.5

 
1,020.9

 
—

 
1,020.9

Depreciation
187.4

 
85.1

 
—

 
272.5

 
5.1

 
277.6

General and administrative
—

 
—

 
—

 
—

 
59.8

 
59.8

Operating income
$
570.7

 
$
343.1

 
$
15.7

 
$
929.5

 
$
(64.9
)
 
$
864.6

Property and equipment, net
$
9,870.7

 
$
3,223.4

 
$
—

 
$
13,094.1

 
$
75.8

 
$
13,169.9



Information about Geographic Areas    

As of June 30, 2016, the geographic distribution of our drilling rigs by reportable segment was as follows:
 
Floaters
 
Jackups
 
Total(1)
North & South America
9
 
7
 
16
Europe & Mediterranean
4
 
11
 
15
Middle East & Africa
2
 
11
 
13
Asia & Pacific Rim
4
 
7
 
11
Asia & Pacific Rim (under construction)
1
 
1
 
2
Middle East & Africa (under construction)
—
 
2
 
2
Held-for-sale
1
 
1
 
2
Total
21
 
40
 
61

(1) 
We provide management services on two rigs owned by third-parties not included in the table above.