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Discontinued Operations (Tables)
 6 Months Ended
Jun. 30, 2016
Discontinued Operations and Disposal Groups [Abstract]  
Summary of Loss from Discontinued Operations
The following table summarizes loss from discontinued operations, net, for the three-month and six-month periods ended June 30, 2016 and 2015 (in millions):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2016
 
2015
 
2016
 
2015
Revenues
$
—

 
$
8.1

 
$
—

 
$
17.7

Operating expenses
1.6

 
11.3

 
2.4

 
33.2

Operating loss
(1.6
)

(3.2
)
 
(2.4
)
 
(15.5
)
Income tax benefit (expense)
0.4

 
(2.9
)
 
0.3

 
9.2

Loss on impairment, net
—

 
(7.2
)
 
—

 
(7.2
)
Gain on disposal of discontinued operations, net
1.0

 
3.2

 
1.0

 
3.2

Loss from discontinued operations, net
$
(.2
)
 
$
(10.1
)
 
$
(1.1
)
 
$
(10.3
)