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Pension and Other Postretirement Benefits (Schedule Of Reconciliation Of The Plans Funded Status And Amounts Reflected) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
Noncurrent liabilities | $ (303.5) | $ (314.3) |
Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at beginning of year | 2,342.3 |  |
Fair value of plan assets at end of year | 2,404.1 | 2,342.3 |
Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation at beginning of year | 2,130.5 | 1,981.3 |
Service cost | 32.0 | 29.2 | $ 31.3
Interest cost | 51.6 | 72.3 | 67.1
Plan participants' contributions | 0.0 | 0.0 |
Plan amendments | 0.0 | 0.0 |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 140.1 | 204.3 |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | 174.5 | 156.6 |
Benefits paid | (174.6) | (156.5) |
Spinoff to Eversource | 121.4 | 0.0 |
Estimated benefits paid by incurred subsidy | 0.0 | 0.0 |
Projected benefit obligation at end of year | 2,058.4 | 2,130.5 | 1,981.3
Actual return on plan assets | 329.9 | 366.8 |
Employer contributions | 2.9 | 2.9 |
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant | 0.0 | 0.0 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan | 59.3 | (49.6) |
Noncurrent assets | 91.4 | 8.2 |
Current liabilities | (2.9) | (3.0) |
Noncurrent liabilities | (29.2) | (54.8) |
Net amount recognized at end of year | 59.3 | (49.6) |
Unrecognized prior service cost | 0.3 | 3.0 |
Unrecognized actuarial loss | 497.2 | 652.8 |
Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Or Regulatory Asset Or Liability | 497.5 | 655.8 |
Pension Plan | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at beginning of year | 2,080.9 | 1,867.7 |
Fair value of plan assets at end of year | 2,117.7 | 2,080.9 | 1,867.7
Other Postretirement Benefits |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit obligation at beginning of year | 576.5 | 492.5 |
Service cost | 6.6 | 5.1 | 5.0
Interest cost | 15.4 | 19.2 | 17.6
Plan participants' contributions | 4.1 | 4.8 |
Plan amendments | 0.0 | 5.1 |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 24.8 | 88.8 |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | 37.0 | 39.5 |
Benefits paid | (37.0) | (39.5) |
Spinoff to Eversource | 0.0 | 0.0 |
Estimated benefits paid by incurred subsidy | 0.4 | 0.5 |
Projected benefit obligation at end of year | 590.8 | 576.5 | 492.5
Actual return on plan assets | 36.3 | 56.9 |
Employer contributions | 21.6 | 23.0 |
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant | 4.1 | 4.7 |
Defined Benefit Plan, Funded (Unfunded) Status of Plan | (304.4) | (315.1) |
Noncurrent assets | 0.0 | 0.0 |
Current liabilities | (0.9) | (0.8) |
Net amount recognized at end of year | (304.4) | (315.1) |
Unrecognized prior service cost | (10.1) | (10.7) |
Unrecognized actuarial loss | 116.4 | 118.4 |
Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Or Regulatory Asset Or Liability | 106.3 | 107.7 |
Other Postretirement Benefits | Fair Value, Inputs, Level 1, 2 and 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of plan assets at beginning of year | 261.4 | 216.3 |
Fair value of plan assets at end of year | $ 286.4 | $ 261.4 | $ 216.3

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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + 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 (j) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 + Details
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