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Leases (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Jan. 01, 2019
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Lessee, Operating Lease, Contingent Liability | $ 6.8 |  | $ 6.8 |  | $ 16.2 |  |
Operating Leases, Rent Expense, Net |  |  |  |  | 4.9 |  |
Operating lease cost | 1.4 |  | 3.0 |  |  |  |
Cash Paid on Operating Leases |  |  | 4.1 |  |  |  |
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability |  |  | 10.7 |  |  |  |
Operating Lease, Right-of-Use Asset | 43.1 | [1] | 43.1 | [1] |  |  | $ 34.5
Operating Lease, Liability | $ 47.8 | [2] | $ 47.8 | [2] |  |  | $ 39.1
Operating Lease, Weighted Average Remaining Lease Term | 13 years 3 months 18 days |  | 13 years 3 months 18 days |  |  |  |
Operating Lease, Weighted Average Discount Rate, Percent | 3.90% |  | 3.90% |  |  |  |
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year | $ 1.7 |  | $ 1.7 |  | 22.1 | [3],[4] |
Lessee, Operating Lease, Liability, Payments, Due Year Two | 6.2 |  | 6.2 |  | 3.9 | [3],[4] |
Lessee, Operating Lease, Liability, Payments, Due Year Three | 5.9 |  | 5.9 |  | 3.5 | [3],[4] |
Lessee, Operating Lease, Liability, Payments, Due Year Four | 5.2 |  | 5.2 |  | 2.9 | [3],[4] |
Lessee, Operating Lease, Liability, Payments, Due Year Five | 5.1 |  | 5.1 |  | 2.9 | [3],[4] |
Lessee, Operating Lease, Liability, Payments, Due after Year Five | 37.8 |  | 37.8 |  | 37.6 | [3],[4] |
Lessee, Operating Lease, Liability, Payments, Due | 61.9 |  | 61.9 |  | $ 72.9 | [3],[4] |
Unrecorded Unconditional Purchase Obligation, Imputed Interest | $ 14.1 |  | $ 14.1 |  |  |  |
[1] | Included in Property, Plant and Equipment in the 2019 Condensed Consolidated Balance Sheet.
[2] | Included in Other Deferred Credits and Other Liabilities in the 2019 Condensed Consolidated Balance Sheet.
[3] | Amounts included for comparability and accounted for in accordance with ASC 840, "Leases."
[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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