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Related Party Transactions (Tables)
 9 Months Ended
Mar. 31, 2017
Related Party Transactions [Abstract]  
Revenue and Expense Transactions Recognized

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Three Months Ended March 31,

 

Nine Months Ended March 31,

 

 

2017

    

2016

 

2017

    

2016

 

 

(in millions)

Revenues

 

$

1.4

 

$

1.7

 

$

4.5

 

$

5.0

Operating costs

 

$

0.2

 

$

0.2

 

$

0.4

 

$

0.4