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Leases (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019
Operating Leased Assets [Line Items] |  |  |  |  |  |
Lessee, Operating Lease, Contingent Liability |  | $ 6.8 | $ 16.2 |  |  |
Operating Leases, Rent Expense, Net |  |  | 4.9 | $ 6.2 | $ 9.3 |
Operating Leases, Future Minimum Payments Due, Next Twelve Months |  |  | 22.1 |  |  |
Operating Leases, Future Minimum Payments, Due in Two Years |  |  | 3.9 |  |  |
Operating Leases, Future Minimum Payments, Due in Three Years |  |  | 3.5 |  |  |
Operating Leases, Future Minimum Payments, Due in Four Years |  |  | 2.9 |  |  |
Operating Leases, Future Minimum Payments, Due in Five Years |  |  | 2.9 |  |  |
Operating Leases, Future Minimum Payments, Due Thereafter |  |  | 37.6 |  |  |
Operating Leases, Future Minimum Payments Due |  |  | 72.9 |  |  |
Operating lease cost |  | 1.4 |  |  |  |
Cash Paid on Operating Leases |  | 3.2 |  |  |  |
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | [1] | 10.7 |  |  |  |
Operating Lease, Right-of-Use Asset | [2] | 44.1 |  |  |  | $ 34.5
Operating Lease, Liability | [3] | $ 48.8 |  |  |  | $ 39.1
Operating Lease, Weighted Average Remaining Lease Term |  | 13 years 6 months |  |  |  |
Operating Lease, Weighted Average Discount Rate, Percent |  | 3.80% |  |  |  |
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year |  | $ 2.5 |  |  |  |
Lessee, Operating Lease, Liability, Payments, Due Year Two |  | 6.2 |  |  |  |
Lessee, Operating Lease, Liability, Payments, Due Year Three |  | 5.9 |  |  |  |
Lessee, Operating Lease, Liability, Payments, Due Year Four |  | 5.2 |  |  |  |
Lessee, Operating Lease, Liability, Payments, Due Year Five |  | 5.1 |  |  |  |
Lessee, Operating Lease, Liability, Payments, Due after Year Five |  | 37.8 |  |  |  |
Lessee, Operating Lease, Liability, Payments, Due |  | 62.7 |  |  |  |
Unrecorded Unconditional Purchase Obligation, Imputed Interest |  | $ 13.9 |  |  |  |
OG&E Railcar Lease Agreement [Member] |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months | [4] |  | 18.6 |  |  |
Operating Leases, Future Minimum Payments, Due in Two Years | [4] |  | 0.0 |  |  |
Operating Leases, Future Minimum Payments, Due in Three Years | [4] |  | 0.0 |  |  |
Operating Leases, Future Minimum Payments, Due in Four Years | [4] |  | 0.0 |  |  |
Operating Leases, Future Minimum Payments, Due in Five Years | [4] |  | 0.0 |  |  |
Operating Leases, Future Minimum Payments, Due Thereafter | [4] |  | 0.0 |  |  |
Operating Leases, Future Minimum Payments Due | [4] |  | 18.6 |  |  |
OG&E Wind Farm Land Lease Agreements [Member] |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months |  |  | 2.5 |  |  |
Operating Leases, Future Minimum Payments, Due in Two Years |  |  | 2.9 |  |  |
Operating Leases, Future Minimum Payments, Due in Three Years |  |  | 2.9 |  |  |
Operating Leases, Future Minimum Payments, Due in Four Years |  |  | 2.9 |  |  |
Operating Leases, Future Minimum Payments, Due in Five Years |  |  | 2.9 |  |  |
Operating Leases, Future Minimum Payments, Due Thereafter |  |  | 37.6 |  |  |
Operating Leases, Future Minimum Payments Due |  |  | 51.7 |  |  |
OGE Energy Building Lease [Member] |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |
Operating Leases, Future Minimum Payments Due, Next Twelve Months |  |  | 1.0 |  |  |
Operating Leases, Future Minimum Payments, Due in Two Years |  |  | 1.0 |  |  |
Operating Leases, Future Minimum Payments, Due in Three Years |  |  | 0.6 |  |  |
Operating Leases, Future Minimum Payments, Due in Four Years |  |  | 0.0 |  |  |
Operating Leases, Future Minimum Payments, Due in Five Years |  |  | 0.0 |  |  |
Operating Leases, Future Minimum Payments, Due Thereafter |  |  | 0.0 |  |  |
Operating Leases, Future Minimum Payments Due |  |  | $ 2.6 |  |  |
[1] | Three Months Ended March 31 (Dollars in millions)2019LEASE COST Operating lease cost$1.4 OTHER INFORMATIONCash paid for amounts included in the measurement of lease liabilities: Operating cash flows for operating leases$3.2Right-of-use assets obtained in exchange for new operating lease liabilities$10.7Right-of-use assets at period end (A)$44.1Operating lease liabilities at period end (B)$48.8Operating lease weighted-average remaining lease term (in years)13.5Operating lease weighted-average discount rate3.8%
[2] | Included in Property, Plant and Equipment in the 2019 Condensed Consolidated Balance Sheet.
[3] | Included in Other Deferred Credits and Other Liabilities in the 2019 Condensed Consolidated Balance Sheet.
[4] | 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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