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RELATED-PARTY TRANSACTIONS (Tables)
 12 Months Ended
Dec. 31, 2016
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions
The amounts of these services follow:
Year Ended December 31,
2016

2015

2014

(millions)
 
 
 
Transportation and storage services from affiliates(1)
$
72.9

$
73.0

$
72.9

Services provided by related parties
65

55.7

51.5

Services provided to related parties
3.2

6.7

6.1

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