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Related-Party Transactions (Tables)
 3 Months Ended
Mar. 31, 2017
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions
The amounts of these services follow:
 
Three Months Ended
 
March 31,
 
2017
2016
(millions)
 
 
Affiliated operator service fee(1)
$
75.9

$
79.8

Transportation and storage services from affiliates(1)
19.6

19.2

Services provided by related parties
10.8

13.5

Services provided to related parties
1.5

0.5

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