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Investments in and Advances to Nonconsolidated Affiliates (Tables)
 9 Months Ended
Sep. 30, 2018
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 September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Net operating revenues
$
10.1

 
$
9.9

 
$
31.6

 
$
31.0

Operating expenses
(5.9
)
 
(5.6
)
 
(19.1
)
 
(18.1
)
Income from continuing operations, net of tax
4.1

 
4.3

 
12.4

 
12.9

Net income
4.1

 
4.3

 
12.4

 
12.9