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Leases (Tables) | 6 Months Ended
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Jun. 30, 2019
Operating Leases [Abstract] |
Lease, Cost [Table Text Block] | (A) Included in Property, Plant and Equipment in the 2019 Condensed Consolidated Balance Sheet. (B) Included in Other Deferred Credits and Other Liabilities in the 2019 Condensed Consolidated Balance Sheet. The following table presents amounts recognized for operating leases in the Company's 2019 Condensed Consolidated Cash Flow Statement and Balance Sheet and supplemental information related to those amounts recognized, as well as a maturity analysis of the Company's operating lease liabilities.
| Six Months Ended
(In millions) | June 30, 2019
Cash paid for amounts included in the measurement of lease liabilities: |
Operating cash flows for operating leases | $ | 4.1 |
Right-of-use assets obtained in exchange for new operating lease liabilities | $ | 10.7 |
(Dollars in millions) | June 30, 2019
Right-of-use assets at period end (A) | $ | 43.1 |
Operating lease liabilities at period end (B) | $ | 47.8 |
Operating lease weighted-average remaining lease term (in years) | 13.3 |
Operating lease weighted-average discount rate | 3.9 | %
Operating Lease Payments Due [Table Text Block] |
Future minimum operating lease payments as of: (In millions) | June 30, 2019 | December 31, 2018 (C)(D)
2019 | $ | 1.7 |  | $ | 22.1 |
2020 | 6.2 |  | 3.9 |
2021 | 5.9 |  | 3.5 |
2022 | 5.2 |  | 2.9 |
2023 | 5.1 |  | 2.9 |
Thereafter | 37.8 |  | 37.6 |
Total future minimum lease payments | 61.9 |  | $ | 72.9 |
Less: Imputed interest | 14.1 |  |
Present value of net minimum lease payments | $ | 47.8 |  |
(C) Amounts included for comparability and accounted for in accordance with ASC 840, "Leases." (D) At the end of the railcar lease term, which was February 1, 2019, OG&E had the option to either purchase the railcars at a stipulated fair market value or renew the lease. OG&E renewed the lease effective February 1, 2019. If OG&E chose not to purchase the railcars or renew the lease agreement and the actual fair value of the railcars was less than the stipulated fair market value, OG&E would have been responsible for the difference in those values up to a maximum of $16.2 million.

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- Definition Operating Leases [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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