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Related-Party Transactions (Tables)
 6 Months Ended
Jun. 30, 2017
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions

The amounts of these services follow:

 

 

 

Three Months Ended June 30,

 

 

Six Months Ended June 30,

 

 

 

2017

 

 

2016

 

 

2017

 

 

2016

 

(millions)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Affiliated operator service fee(1)

 

$

79.7

 

 

$

78.9

 

 

$

155.6

 

 

$

158.7

 

Transportation and storage services from

   affiliates(1)

 

 

17.3

 

 

 

17.3

 

 

 

36.9

 

 

 

36.5

 

Services provided by related parties

 

 

11.1

 

 

 

12.6

 

 

 

21.9

 

 

 

26.1

 

Services provided to related parties

 

 

1.4

 

 

 

0.5

 

 

 

2.9

 

 

 

1.0

 

(1)

The costs of these services were included in cost of sales in Questar Gas' Statements of Income.