No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. The minimum price at which unvested restricted shares are converted into shares and distributed under the plan No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. Amount of the cumulative drug benefit subsidy related to prescription drug benefits attributed to past service. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. The minimum price within a price range of unvested restricted shares transferred to the equity method investee, due to Spinoff. No authoritative reference available. The interest rate used to adjust for the time value of money for the plan, subsequent to the decrease resulting from the transfer of benefit obligation to the equity method investee, due to Spinoff. This Spinoff triggered re-measurements resulting in increased expenses year-over-year. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. The employer's best estimate of qualified pension plan expense for the current fiscal year. Since the company plans to fund the qualified retirement plan in amounts approximately equal to the yearly expense, this element also represents estimated employer contributions expected to be paid for the current fiscal year. No authoritative reference available. The employer's best estimate of accretion of regulatory liability for the current fiscal year. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. The minimum price at which granted unvested restricted shares are converted into shares under the plan No authoritative reference available. Pre tax change in accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges, for derivatives transferred to the affiliate due to Spinoff. No authoritative reference available. No authoritative reference available. No authoritative reference available. Disclosure of assumptions used to determine fair value of a stock option or other award plan under which share-based compensation is awarded to employees. Disclosure may also include method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period. No authoritative reference available. The number of shares reserved for issuance under stock option agreements awarded under the plan, to officers, employees and nonemployee directors of the equity method investee, that validly exist and are outstanding as of the balance-sheet date, including vested options. No authoritative reference available. No authoritative reference available. No authoritative reference available. The number of outstanding awards on stock option plans for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options transferred to the equity method investee, due to Spinoff. No authoritative reference available. The maximum exercise price within a price range of options outstanding. No authoritative reference available. No authoritative reference available. No authoritative reference available. Represents the number of shares of subsidiaries' common stock received by each shareholder, for each share of common stock held at the close of business on the record date, including fractional shares. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges, for derivatives of discontinued operations. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. This item represents long-term debt including the current portion of same debt as of the balance sheet date. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. This item represents short-term debt as of the balance sheet date. No authoritative reference available. The weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. These grantees are certain officers, employees and nonemployee directors of the equity method investee. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. This item represents checks outstanding in excess of cash balances as of the balance sheet date. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. The exercise price of options granted during the reporting period No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. The ratio used to modify the exercise price of options and the grant-day prices of restricted shares, to generally preserve the potential benefits under the LTSIP prior to the Spinoff. No authoritative reference available. The weighted average fair value at grant for nonvested restricted stock units issued during the period. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. The ratio used to modify the exercise price of options and the grant-day prices of restricted shares, to generally preserve the potential benefits under the LTSIP prior to the Spinoff. No authoritative reference available. The maximum exercise price of options exercised during the reporting period No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. The reduction in the number of reserved shares that could potentially be issued under the option plan attributable to employees transferred to the the equity method investee, due to Spinoff. No authoritative reference available. No authoritative reference available. No authoritative reference available. Month, day and year when all of the shares of a subsidiaries' common stock held by the company was distributed to the company's shareholders as a tax-free, pro-rata dividend (the Spinoff). No authoritative reference available. The weighted average fair value of unvested restricted shares for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares, awarded to officers, employees and nonemployee directors of the equity method investee. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. The number of outstanding awards on stock option plans for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares. Granted to certain officers, employees and non-employee directors of the Company as a result of the Spinoff and bifurcation of share-based awards. No authoritative reference available. Disclosure of the components of accumulated other comprehensive income (loss), net of income taxes, shown on the Condensed Consolidated Balance Sheets. No authoritative reference available. No authoritative reference available. No authoritative reference available. As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are nonvested. Granted to certain officers, employees and non-employee directors of the Company as a result of the Spinoff and bifurcation of share-based awards. No authoritative reference available. No authoritative reference available. No authoritative reference available. The maximum price within a price range of unvested restricted shares transferred to the equity method investee, due to Spinoff. No authoritative reference available. No authoritative reference available. No authoritative reference available. Price-per-share of common stock issued by the company. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. Description of the period of time over which an employee's right to exercise a restricted stock unit award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year). No authoritative reference available. The number of complementary lines of business the company conducts. No authoritative reference available. The minimum exercise price of options exercised during the reporting period No authoritative reference available. The minimum exercise price within a price range of options outstanding. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. The maximum price within a price range of unvested restricted shares. No authoritative reference available. Amount of equity contributed to an affiliate prior to Spinoff. The affiliate is recorded as an equity method investment on the Company's consolidated balance sheets. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. The number of outstanding unvested restricted shares for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares. Granted to certain officers, employees and non-employee directors of the Company as a result of the Spinoff and bifurcation of share-based awards. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. The number of restricted stock units issued during the period. No authoritative reference available. The minimum exercise price within a price range of options transferred to the equity method investee, due to Spinoff. No authoritative reference available. No authoritative reference available. No authoritative reference available. The weighted average fair value of unvested restricted shares for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares. Granted to certain officers, employees and non-employee directors of the Company as a result of the Spinoff and bifurcation of share-based awards. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. The number of unvested restricted shares awarded under the plan, to officers, employees and nonemployee directors of the equity method investee, that validly exist and are outstanding as of the balance-sheet date. No authoritative reference available. No authoritative reference available. No authoritative reference available. Spinoff of subsidiary and portion of the benefits plans that caused a re-measurement of obligations. No authoritative reference available. As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are nonvested. No authoritative reference available. No authoritative reference available. No authoritative reference available. The employer's best estimate of postretirement benefits expense for the current fiscal year, before accretion of regulatory liability. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. The reduction in the number of unvested restricted shares that could potentially be issued under the LTSIP attributable to employees transferred to the the equity method investee, due to Spinoff. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. Amount of noncash dividend distributed to shareholders as a tax-free pro rata dividend (the Spinoff). No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. The decrease in the number of unvested stock options, or conversely, the number of stock options vested during the period. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. Schedule of the reconciliation of the components of basic and diluted shares used in the earnings per share calculation. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. Month, day and year when the reincorporation merger was approved, and the merger is effective. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. Noncontrolling interest of discontinued operations. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. The weighted-average period remaining as of the balance-sheet date until option expiration pertaining to the outstanding stock options awarded to certain officers, employees and nonemployee directors of the equity method investee, which may be expressed in a variety of ways (for example, years, months). No authoritative reference available. No authoritative reference available. No authoritative reference available. The employer's best estimate of nonqualified pension plan expense for the current fiscal year. The nonqualified pension plan is unfunded. No authoritative reference available. No authoritative reference available. No authoritative reference available. Amount of severance costs attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. A reconciliation of the asset retirement obligation from the beginning of a period to the end of a period. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. No authoritative reference available. No authoritative reference available. No authoritative reference available. The minimum price within a price range of unvested restricted shares. No authoritative reference available. No authoritative reference available. No authoritative reference available. The maximum price at which unvested restricted shares are converted into shares and distributed under the plan No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. The maximum exercise price within a price range of options transferred to the equity method investee, due to Spinoff. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. Net change in cash associated with the entity's continuing operations. No authoritative reference available. No authoritative reference available. No authoritative reference available. The weighted average fair value at grant for nonvested share-based awards issued during the period on other than stock option plans (for example, phantom stock plan, stock appreciation rights plan, performance target plan), transferred to the equity method investee due to Spinoff. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. The interest rate used to adjust for the time value of money for the plan, prior to the decrease resulting from the transfer of benefit obligation to the equity method investee, due to Spinoff. This Spinoff triggered re-measurements resulting in increased expenses year-over-year. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. Annual amortization amount of the Medicare Part D subsidy benefit, which reduces net periodic postretirement benefit cost through a decrease in the amortization of the unrecognized net loss. No authoritative reference available. The maximum price at which granted unvested restricted shares are converted into shares under the plan No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. Disclosure of the components of comprehensive income (loss) attributable to Questar. No authoritative reference available. No authoritative reference available. No authoritative reference available. Describes an entity's application of the equity method of accounting to investments. The description includes information such as: initially recording an investment in the stock of an investee at cost; adjusting the carrying amount of the investment to recognize the investor's share of the earnings or losses of the investee and adjustments to reflect the investor's share of changes in the investee's capital. An entity also may describe how such investments are assessed for impairment. No authoritative reference available. No authoritative reference available. No authoritative reference available. A periodic charge recognizing amounts collected in rates in excess of actual postretirement expenses. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available. No authoritative reference available.