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Discontinued Operations (Tables)
 12 Months Ended
Dec. 31, 2018
Discontinued Operations and Disposal Groups [Abstract]  
Summary Of Rig Sales and Income From Discontinued Operations
The following rig sales were included in discontinued operations during the three-year period ended December 31, 2018 (in millions):
Rig
 
Date of Sale
 
Segment(1)
 
Net Proceeds
 
Net Book Value(2)
 
Pre-tax Gain (Loss)
ENSCO 7500
 
April 2018
 
Floaters
 
$
2.6

 
$
1.5

 
$
1.1

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
)
 
 
 
 
 
 
$
9.2

 
$
6.9

 
$
2.3


(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, 2018 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.

The following table summarizes income (loss) from discontinued operations for each of the years in the three-year period ended December 31, 2018 (in millions):
 
2018
 
2017
 
2016
Revenues
$
—

 
$
—

 
$
—

Operating expenses
2.0

 
1.5

 
3.1

Operating loss
(2.0
)
 
(1.5
)
 
(3.1
)
Income tax expense (benefit)
7.1

 
(2.1
)
 
(10.1
)
Gain on disposal of discontinued operations, net
1.0

 
.4

 
1.1

Income (loss) from discontinued operations
$
(8.1
)
 
$
1.0

 
$
8.1