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Postretirement Benefits Other Than Pensions - Components Of Comprehensive OPEB (Income) Expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Unrecognized OPEB Gain Arising During the Year | $ 4.8 | $ 8.0 | $ (3.9) |
Amortization of Accumulated Unrecognized OPEB Gain | 3.0 | (1.1) | 0.6 |
Other Postretirement Benefit Plan, Defined Benefit |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service Cost Earned During the Year | 0.2 | 0.2 | 0.1 |
Interest Cost on Accumulated Postretirement Benefit Obligation | 0.4 | 0.4 | 0.4 |
Amortization of Prior Service Credit | (1.3) | (1.3) | 0.0 |
Amortization of Accumulated Unrecognized OPEB Gain | (2.4) | (1.8) | (1.8) |
Pension Income Recognized in Consolidated Statements of Income | (3.1) | (2.5) | (1.3) |
Unrecognized OPEB Gain Arising During the Year | (1.7) | (3.0) | (0.5) |
Prior Service Credit Arising During the Year from Plan Amendments | 0.0 | 0.0 | (1.3) | $ 11.0
Amortization of Prior Service Credit | 1.3 | 1.3 | 0.0 |
Amortization of Accumulated Unrecognized OPEB Gain | 2.4 | 1.8 | 1.8 |
Comprehensive OPEB Income | $ (1.1) | $ (2.4) | $ (1.3) |

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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