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Leases, Codification Topic 842 (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Leases [Abstract] |  |  |  |
Lessee, Operating Lease, Contingent Liability |  | $ 6.8 |  |
Operating Lease, Cost |  | 6.4 | $ 6.0 | $ 4.9
Operating Leased Assets [Line Items] |  |  |  |
Cash Paid on Operating Leases |  | 6.4 | 5.6 |
Operating Lease, Right-of-Use Asset | [1] | 37.6 | 40.9 |
Operating Lease, Liability | [2] | $ 42.3 | $ 45.8 |
Operating Lease, Weighted Average Remaining Lease Term |  | 12 years 6 months | 13 years 1 month 6 days |
Operating Lease, Weighted Average Discount Rate, Percent |  | 3.90% | 3.90% |
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability |  | $ 1.4 | $ 10.7 |
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months |  | 6.3 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Two |  | 5.7 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Three |  | 5.1 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Four |  | 3.2 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Five |  | 3.0 |  |
Lessee, Operating Lease, Liability, Payments, Due after Year Five |  | 31.7 |  |
Lessee, Operating Lease, Liability, Payments, Due |  | 55.0 |  |
Lessee, Operating Lease, Liability, Undiscounted Excess Amount |  | 12.7 |  |
Lessee, Operating Lease, Contingent Liability |  | 6.8 |  |
Operating Lease, Cost |  | 6.4 | 6.0 | 4.9
Og and E [Member] |  |  |  |
Leases [Abstract] |  |  |  |
Operating Lease, Cost |  | 5.5 | 5.1 | 4.1
Operating Leased Assets [Line Items] |  |  |  |
Cash Paid on Operating Leases |  | 5.5 | 4.8 |
Operating Lease, Right-of-Use Asset | [1] | 37.0 | 39.6 |
Operating Lease, Liability | [2] | $ 41.7 | $ 44.3 |
Operating Lease, Weighted Average Remaining Lease Term |  | 12 years 8 months 12 days | 13 years 6 months |
Operating Lease, Weighted Average Discount Rate, Percent |  | 3.90% | 3.90% |
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability |  | $ 1.4 | $ 10.7 |
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months |  | 5.7 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Two |  | 5.7 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Three |  | 5.1 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Four |  | 3.2 |  |
Lessee, Operating Lease, Liability, Payments, Due Year Five |  | 3.0 |  |
Lessee, Operating Lease, Liability, Payments, Due after Year Five |  | 31.7 |  |
Lessee, Operating Lease, Liability, Payments, Due |  | 54.4 |  |
Lessee, Operating Lease, Liability, Undiscounted Excess Amount |  | 12.7 |  |
Operating Lease, Cost |  | $ 5.5 | $ 5.1 | $ 4.1
[1] | Included in Property, Plant and Equipment in the Registrants' balance sheets.
[2] | Included in Other Deferred Credits and Other Liabilities in the Registrants' balance sheets.

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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease due after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980 + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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