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Leases (Tables) | 3 Months Ended
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Mar. 31, 2019
Operating Leases [Abstract] |
Lease, Cost [Table Text Block] | The following table presents amounts recognized for operating leases in the Company's Condensed Consolidated Financial Statements and supplemental information related to those amounts recognized.
Three Months Ended March 31 (Dollars in millions) | 2019
LEASE COST |
Operating lease cost | $ | 1.4 |
OTHER INFORMATION |
Cash paid for amounts included in the measurement of lease liabilities: |
Operating cash flows for operating leases | $ | 3.2 |
Right-of-use assets obtained in exchange for new operating lease liabilities | $ | 10.7 |
Right-of-use assets at period end (A) | $ | 44.1 |
Operating lease liabilities at period end (B) | $ | 48.8 |
Operating lease weighted-average remaining lease term (in years) | 13.5 |
Operating lease weighted-average discount rate | 3.8 | %
(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.
Operating Lease Payments Due [Table Text Block] | The following table presents a maturity analysis of the Company's operating lease liabilities.
Three Months Ended March 31, 2019 (In millions) | Operating Lease Payments
2019 (excluding three months ended March 31) | $ | 2.5 |
2020 | 6.2 |
2021 | 5.9 |
2022 | 5.2 |
2023 | 5.1 |
Thereafter | 37.8 |
Total lease payments | 62.7 |
Less: imputed interest | 13.9 |
Total | $ | 48.8 |
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] | As of December 31, 2018, future minimum payments for noncancellable operating leases were as follows:
Year Ended December 31 (In millions) | 2019 | 2020 | 2021 | 2022 | 2023 | Thereafter | Total
Operating lease obligations: |  |  |  |  |  |  |
Railcars (A) | $ | 18.6 |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | — |  | $ | 18.6 |
Wind farm land leases | 2.5 |  | 2.9 |  | 2.9 |  | 2.9 |  | 2.9 |  | 37.6 |  | 51.7 |
Office space lease | 1.0 |  | 1.0 |  | 0.6 |  | — |  | — |  | — |  | 2.6 |
Total operating lease obligations | $ | 22.1 |  | $ | 3.9 |  | $ | 3.5 |  | $ | 2.9 |  | $ | 2.9 |  | $ | 37.6 |  | $ | 72.9 |
(A) 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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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 + Details
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