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

The amounts of these services follow:

 

 

 

Three Months Ended September 30,

 

 

Nine Months Ended September 30,

 

 

 

2017

 

 

2016

 

 

2017

 

 

2016

 

(millions)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Affiliated operator service fee(1)

 

$

74.8

 

 

$

77.7

 

 

$

230.4

 

 

$

236.4

 

Transportation and storage services from affiliates(1)

 

 

17.4

 

 

 

17.4

 

 

 

54.3

 

 

 

53.9

 

Services provided by related parties

 

 

17.1

 

 

 

22.9

 

 

 

39.0

 

 

 

49.0

 

Services provided to related parties

 

 

1.6

 

 

 

0.5

 

 

 

4.5

 

 

 

1.5

 

(1)

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