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Investments in and Advances to Nonconsolidated Affiliates (Tables)
 6 Months Ended
Jun. 30, 2017
Investments in and Advances to Affiliates, Schedule of Investments [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 June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
Net operating revenues
$
10.4

 
$
10.9

 
$
21.2

 
$
22.1

Operating expenses
(6.0
)
 
(5.8
)
 
(12.1
)
 
(12.1
)
Income from continuing operations, net of tax
4.4

 
5.0

 
9.0

 
10.0

Net income
4.4

 
5.0

 
9.0

 
10.0