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Related Party Transactions (Tables)
 6 Months Ended
Dec. 31, 2016
Related Party Transactions [Abstract]  
Revenue and Expense Transactions Recognized

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Three Months Ended December 31,

 

Six Months Ended December 31,

 

 

2016

    

2015

 

2016

    

2015

 

 

(in millions)

Revenues

 

$
1.5

 

$
1.6

 

$
3.1

 

$
3.3

Operating costs

 

$
0.1

 

$
0.1

 

$
0.2

 

$
0.2