The details of Questar's consolidated cost of sales are as follows: | | | | | | | | | | | | | | | | | | 3 Months Ended | | 12 Months Ended | | March 31, | | March 31, | | 2015 | | 2014 | | 2015 | | 2014 | | (in millions) | Questar Gas | | | | | | | | Gas purchases | $ | 41.0 |
| | $ | 92.7 |
| | $ | 84.8 |
| | $ | 176.0 |
| Operator service fee | 84.8 |
| | 89.1 |
| | 345.4 |
| | 310.9 |
| Transportation and storage | 22.2 |
| | 22.1 |
| | 79.7 |
| | 80.2 |
| Gathering | 5.4 |
| | 4.9 |
| | 21.5 |
| | 19.1 |
| Royalties | 11.9 |
| | 17.3 |
| | 54.7 |
| | 50.5 |
| Storage (injection) withdrawal, net | 30.9 |
| | 33.0 |
| | (3.2 | ) | | 3.4 |
| Purchased-gas account adjustment | 36.2 |
| | (5.6 | ) | | (4.0 | ) | | (30.3 | ) | Other | 1.2 |
| | 1.1 |
| | 4.9 |
| | 4.8 |
| Total Questar Gas cost of natural gas sold | 233.6 |
| | 254.6 |
| | 583.8 |
| | 614.6 |
| Elimination of Questar Gas cost of natural gas sold - affiliated companies | (104.0 | ) | | (108.2 | ) | | (419.2 | ) | | (387.0 | ) | Total Questar Gas cost of natural gas sold - unaffiliated parties | 129.6 |
| | 146.4 |
| | 164.6 |
| | 227.6 |
| Questar Pipeline | | | | | | | | Total Questar Pipeline cost of sales | 1.9 |
| | 1.7 |
| | 4.2 |
| | 6.6 |
| Other cost of sales | 0.3 |
| | 0.1 |
| | 1.1 |
| | 0.2 |
| Total cost of sales | $ | 131.8 |
| | $ | 148.2 |
| | $ | 169.9 |
| | $ | 234.4 |
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