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RELATED-PARTY TRANSACTIONS (Tables)
 12 Months Ended
Dec. 31, 2017
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions

The amounts of these services follow:

 

Year Ended December 31,

 

2017

 

 

2016

 

 

2015

 

(millions)

 

 

 

 

 

 

 

 

 

 

 

 

Transportation and storage services from affiliates(1)

 

$

73.7

 

 

$

72.9

 

 

$

73.0

 

Services provided by related parties

 

 

50.2

 

 

 

65.0

 

 

 

55.7

 

Services provided to related parties

 

 

6.0

 

 

 

3.2

 

 

 

6.7

 

 

(1)

The costs of these services were included in purchased gas in Questar Gas' Statements of Income.