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GOODWILL (Tables)
 12 Months Ended
Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill

The changes in Questar Gas' carrying amount and segment allocation of goodwill are presented below:

 

 

Gas

Infrastructure

 

 

Corporate and Other

 

 

Total

 

(millions)

 

 

 

 

 

 

 

 

 

 

 

 

Balance at December 31, 2015(1)

 

$

5.6

 

 

$

—

 

 

$

5.6

 

No events affecting goodwill

 

 

—

 

 

 

—

 

 

 

—

 

Balance at December 31, 2016(1)

 

$

5.6

 

 

$

—

 

 

$

5.6

 

No events affecting goodwill

 

 

—

 

 

 

—

 

 

 

—

 

Balance at December 31, 2017(1)

 

$

5.6

 

 

$

—

 

 

$

5.6

 

 

(1)

There are no accumulated impairment losses.