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Discontinued Operations (Tables)
 9 Months Ended
Sep. 30, 2015
Discontinued Operations and Disposal Groups [Abstract]  
Summary of Loss from Discontinued Operations
The following table summarizes (loss) income from discontinued operations, net for the three-month and nine-month periods ended September 30, 2015 and 2014 (in millions):
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2015
 
2014
 
2015
 
2014
Revenues
$
1.7

 
$
79.0

 
$
19.4

 
$
298.4

Operating expenses
5.6

 
72.4

 
38.8

 
324.0

Operating (loss) income
(3.9
)

6.6

 
(19.4
)
 
(25.6
)
Income tax (expense) benefit
(2.1
)
 
(11.7
)
 
7.1

 
(23.2
)
Loss on impairment, net
(17.3
)
 
—

 
(24.5
)
 
(796.8
)
Gain on disposal of discontinued operations, net
—

 
14.3

 
3.2

 
34.4

(Loss) income from discontinued operations, net
$
(23.3
)
 
$
9.2

 
$
(33.6
)
 
$
(811.2
)