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Discontinued Operations (Tables)
 12 Months Ended
Dec. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]  
Summary Of Rig Sales and Income From Discontinued Operations
The following table summarizes income (loss) from discontinued operations for each of the years in the three-year period ended December 31, 2017 (in millions):
 
2017
 
2016
 
2015
Revenues
$
—

 
$
—

 
$
19.5

Operating expenses
1.5

 
3.1

 
39.5

Operating loss
(1.5
)
 
(3.1
)
 
(20.0
)
Income tax benefit
(2.1
)
 
(10.1
)
 
(7.7
)
Loss on impairment, net
—

 
—

 
(120.6
)
Gain on disposal of discontinued operations, net
.4

 
1.1

 
4.3

Income (loss) from discontinued operations
$
1.0

 
$
8.1

 
$
(128.6
)
The following rig sales were included in discontinued operations during the three-year period ended December 31, 2017 (in millions):
Rig
 
Date of Sale
 
Segment(1)
 
Net Proceeds
 
Net Book Value(2)
 
Pre-tax Gain/(Loss)
ENSCO 90
 
June 2017
 
Jackups
 
$
.3

 
$
.3

 
$
—

ENSCO DS-2
 
May 2016
 
Floaters
 
5.0

 
4.0

 
1.0

ENSCO 58
 
April 2016
 
Jackups
 
.7

 
.3

 
.4

ENSCO 6000
 
April 2016
 
Floaters
 
.6


.8

 
(.2
)
ENSCO 5001
 
December 2015
 
Floaters
 
2.4

 
2.5

 
(.1
)
ENSCO 5002
 
June 2015
 
Floaters
 
1.6

 
—

 
1.6

 
 
 
 
 
 
$
10.6

 
$
7.9

 
$
2.7


(1) The rigs' operating results were reclassified to discontinued operations in our consolidated statements of operations for each of the years in the three-year period ended December 31, 2017 and were previously included within the specified operating segment.

(2) Includes the rig's net book value as well as inventory and other assets on the date of the sale.