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Related-Party Transactions (Tables)
 9 Months Ended
Sep. 30, 2018
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,

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

(millions)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Affiliated operator service fee(1)

 

$

60.5

 

 

$

74.8

 

 

$

192.0

 

 

$

230.4

 

Transportation and storage services from affiliates(1)

 

 

17.5

 

 

 

17.4

 

 

 

55.1

 

 

 

54.3

 

Services provided by related parties

 

 

13.1

 

 

 

17.1

 

 

 

41.9

 

 

 

39.0

 

Services provided to related parties

 

 

1.3

 

 

 

1.6

 

 

 

4.0

 

 

 

4.5

 

 (1)The costs of these services were included in purchased gas in Questar Gas’ Statements of Income.