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Retirement Plans and Postretirement Benefit Plans | 6 Months Ended
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Jun. 30, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] |
Pension and Other Postretirement Benefits Disclosure [Text Block] | Retirement Plans and Postretirement Benefit Plans The details of net periodic benefit cost, before consideration of capitalized amounts, of the Company's Pension Plan, the Restoration of Retirement Income Plan and the postretirement benefit plans included in the Condensed Consolidated Financial Statements are as follows: Net Periodic Benefit Cost
| Pension Plan |  | Restoration of Retirement Income Plan
| Three Months Ended | Six Months Ended |  | Three Months Ended | Six Months Ended
| June 30, | June 30, |  | June 30, | June 30,
(In millions) | 2015 (B) | 2014 (B) | 2015 (C) | 2014 (C) |  | 2015 (B) | 2014 (B) | 2015 (C) | 2014 (C)
Service cost | $ | 3.4 |  | $ | 3.3 |  | $ | 7.9 |  | $ | 7.6 |  |  | $ | 0.2 |  | $ | 0.2 |  | $ | 0.6 |  | $ | 0.5 |
Interest cost | 6.6 |  | 7.1 |  | 13.0 |  | 14.1 |  |  | 0.1 |  | 0.1 |  | 0.3 |  | 0.3 |
Expected return on plan assets | (11.7 | ) | (10.2 | ) | (23.5 | ) | (22.7 | ) |  | — |  | — |  | — |  | — |
Amortization of net loss | 5.4 |  | 3.6 |  | 9.7 |  | 7.1 |  |  | 0.2 |  | 0.1 |  | 0.3 |  | 0.1 |
Amortization of unrecognized prior service cost (A) | 0.1 |  | 0.5 |  | 0.2 |  | 0.9 |  |  | 0.1 |  | 0.1 |  | 0.1 |  | 0.1 |
Total net periodic benefit cost | 3.8 |  | 4.3 |  | 7.3 |  | 7.0 |  |  | 0.6 |  | 0.5 |  | 1.3 |  | 1.0 |
Less: Amount paid by unconsolidated affiliates | 1.0 |  | 0.9 |  | 2.1 |  | 1.7 |  |  | 0.1 |  | 0.1 |  | 0.1 |  | 0.1 |
Net periodic benefit cost (net of unconsolidated affiliates) | $ | 2.8 |  | $ | 3.4 |  | $ | 5.2 |  | $ | 5.3 |  |  | $ | 0.5 |  | $ | 0.4 |  | $ | 1.2 |  | $ | 0.9 |
(A) | Unamortized prior service cost is amortized on a straight-line basis over the average remaining service period to the first eligibility age of participants who are expected to receive a benefit and are active at the date of the plan amendment.
(B) | In addition to the $3.3 million and $3.8 million of net periodic benefit cost recognized during the three months ended June 30, 2015 and 2014, respectively, OG&E recognized an increase in pension expense during the three months ended June 30, 2015 and 2014 of $2.4 million and $2.3 million, respectively, to maintain the allowable amount to be recovered for pension expense in the Oklahoma jurisdiction which are included in the Pension tracker regulatory liability (see Note 1).
(C) | In addition to the $6.4 million and $6.2 million of net periodic benefit cost recognized during the six months ended June 30, 2015 and 2014, respectively, OG&E recognized an increase in pension expense during the six months ended June 30, 2015 and 2014 of $5.4 million and $5.6 million, respectively, to maintain the allowable amount to be recovered for pension expense in the Oklahoma jurisdiction which are included in the Pension tracker regulatory liability (see Note 1).
| Postretirement Benefit Plans
| Three Months Ended | Six Months Ended
| June 30, | June 30,
(In millions) | 2015 (B) | 2014 (B) | 2015 (C) | 2014 (C)
Service cost | $ | 0.3 |  | $ | 0.7 |  | $ | 0.8 |  | $ | 1.6 |
Interest cost | 2.5 |  | 2.9 |  | 5.1 |  | 5.7 |
Expected return on plan assets | (0.6 | ) | (0.6 | ) | (1.2 | ) | (1.2 | )
Amortization of net loss | 3.5 |  | 3.1 |  | 6.9 |  | 6.2 |
Amortization of unrecognized prior service cost (A) | (4.2 | ) | (4.2 | ) | (8.3 | ) | (8.3 | )
Total net periodic benefit cost | 1.5 |  | 1.9 |  | 3.3 |  | 4.0 |
Less: Amount paid by unconsolidated affiliates | 0.3 |  | 0.4 |  | 0.6 |  | 0.7 |
Net periodic benefit cost (net of unconsolidated affiliates) | $ | 1.2 |  | $ | 1.5 |  | $ | 2.7 |  | $ | 3.3 |
(A) | Unamortized prior service cost is amortized on a straight-line basis over the average remaining service period to the first eligibility age of participants who are expected to receive a benefit and are active at the date of the plan amendment.
(B) | In addition to the $1.2 million and $1.5 million of net periodic benefit cost recognized during the three months ended June 30, 2015 and 2014, respectively, OG&E recognized an increase in postretirement medical expense during the three months ended June 30, 2015 and 2014 of $1.5 million and $1.4 million, respectively, to maintain the allowable amount to be recovered for postretirement medical expense in the Oklahoma jurisdiction which are included in the Pension tracker regulatory liability (see Note 1).
(C) | In addition to the $2.7 million and $3.3 million of net periodic benefit cost recognized during the six months ended June 30, 2015 and 2014, respectively, OG&E recognized an increase in postretirement medical expense during the six months ended June 30, 2015 and 2014 of $2.9 million and $2.6 million, respectively, to maintain the allowable amount to be recovered for postretirement medical expense in the Oklahoma jurisdiction which are included in the Pension tracker regulatory liability (see Note 1).
| Three Months Ended | Six Months Ended
| June 30, | June 30,
(In millions) | 2015 | 2014 | 2015 | 2014
Capitalized portion of net periodic pension benefit cost | $ | 1.2 |  | $ | 1.1 |  | $ | 2.0 |  | $ | 1.7 |
Capitalized portion of net periodic postretirement benefit cost | 0.4 |  | 0.5 |  | 0.9 |  | 1.0 |

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