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Discontinued Operations (Tables)
 3 Months Ended
Mar. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]  
Summary of Loss from Discontinued Operations
The following table summarizes loss from discontinued operations, net, for the quarters ended March 31, 2015 and 2014 (in millions):
 
2015
 
2014
Revenues
$
9.6

 
$
120.3

Operating expenses
21.9

 
136.7

Operating loss
(12.3
)
 
(16.4
)
Income tax benefit (expense)
12.1

 
(5.0
)
Gain on disposal of discontinued operations, net
—

 
19.4

Loss from discontinued operations, net
$
(.2
)
 
$
(2.0
)