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Investments in and Advances to Nonconsolidated Affiliates (Tables)
 9 Months Ended
Sep. 30, 2014
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]  
Schedule of Combined Results of Operations of Equity Method Affiliates
The following summarizes the combined results of operations of our equity method affiliates (on a 100% basis, in millions):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2014
 
2013
 
2014
 
2013
Net operating revenues
$
7.8

 
$
16.2

 
$
44.1

 
$
55.4

Operating expenses
(3.3
)
 
(10.3
)
 
(22.7
)
 
(32.5
)
Income from continuing operations, net of tax
4.2

 
4.4

 
28.2

 
18.4

Net income
4.2

 
4.4

 
28.2

 
18.4