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Investments in and Advances to Nonconsolidated Affiliates (Tables)
3 Months Ended
Mar. 31, 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 March 31,
 
2018
 
2017
Net operating revenues
$
11.0

 
$
10.8

Operating expenses
(7.6
)
 
(6.3
)
Income from continuing operations, net of tax
3.4

 
4.4

Net income
3.4

 
4.4