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Discontinued Operations (Tables)
 6 Months Ended
Jun. 30, 2015
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, 2015 and 2014 (in millions):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2015
 
2014
 
2015
 
2014
Revenues
$
8.1

 
$
99.1

 
$
17.7

 
$
219.4

Operating expenses
11.3

 
114.9

 
33.2

 
251.6

Operating loss
(3.2
)

(15.8
)
 
(15.5
)
 
(32.2
)
Income tax (expense) benefit
(2.9
)
 
(6.5
)
 
9.2

 
(11.5
)
Loss on impairment, net
(7.2
)
 
(796.8
)
 
(7.2
)
 
(796.8
)
Gain on disposal of discontinued operations, net
3.2

 
.7

 
3.2

 
20.1

Loss from discontinued operations, net
$
(10.1
)
 
$
(818.4
)
 
$
(10.3
)
 
$
(820.4
)